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Jose Mourinho believes referee Chris Foy's performance in the defeat at Aston Villa could cost Chelsea the title.
Premier League leaders Chelsea, who play Crystal Palace on Saturday, lost 1-0 at Villa Park in a match which saw Mourinho sent to the stands following the dismissals of Willian and Ramires.
Mourinho maintains Manchester City are title favourites and Liverpool have a strong chance, while he refused to rule out Arsenal despite hammering the Gunners 6-0 last weekend.
If the Blues are beaten by one or two points in the title race, Mourinho will look no further than this month's defeat at Aston Villa, which still leaves him seething at the performance of referee Foy.
Asked if the Villa match could be pinpointed as costly come the end of the season, Mourinho said: "Yes, because the other matches we lost because we didn't play well, because the opponent was better than us, because we missed big chances.
"If you go to the other matches you find the natural reasons for losing a match, if you go to the Villa match it's difficult.
Chelsea: The latest match picturesShow all 63 1 /63Chelsea: The latest match pictures Chelsea: The latest match pictures Cardiff 1 Chelsea 2 Chelsea teammates celebrate with Fernando Torres after his winning goal
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Chelsea: The latest match pictures Cardiff 1 Chelsea 2 Fernando Torres scores the Blue's second to complete the turn around
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Chelsea: The latest match pictures Cardiff 1 Chelsea 2 David Marshall fails to keep out Andre Schurrle's equaliser
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Chelsea: The latest match pictures Cardiff 1 Chelsea 2 Cardiff teammates celebrate after Craig Bellamy's opener
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Chelsea: The latest match pictures Cardiff 1 Chelsea 2 Craig Bellamy fires home the opening goal for the home side
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Chelsea: The latest match pictures Chelsea 0 Norwich 0 John Terry applauds the Chelsea crowd at the final whistle
Chelsea: The latest match pictures Chelsea 0 Norwich 0 John Terry competes with Johan Elmander for the ball
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Chelsea: The latest match pictures Chelsea 0 Norwich 0 Martin Olsson goes down in the penalty area under the challenge of John Terry
Chelsea: The latest match pictures Chelsea 0 Norwich 0 Jose Mourinho looks on from the touchline
Chelsea: The latest match pictures Chelsea 0 Norwich 0 Eden Hazard is challenged by Ryan Bennett in the penalty area
Chelsea: The latest match pictures Chelsea 0 Norwich 0 Branislav Ivanovic leads the protests after referee Neil Swarbrick turns down Chelsea penalty appeals
Chelsea: The latest match pictures Chelsea 0 Norwich 0 Gary Cahill blocks Robert Snodgrass' shot late in the game
Chelsea: The latest match pictures Chelsea 0 Norwich 0 Norwich manager Neil Adams acknowledges his players at the final whistle
Chelsea: The latest match pictures Chelsea 0 Norwich 0 The Norwich players gather in a huddle before kick-off
Chelsea: The latest match pictures Chelsea 1 Atletico Madrid 3 Jose Mourinho admitted he had been outsmarted by Diego Simeone
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Chelsea: The latest match pictures Chelsea 1 Atletico Madrid 3 Captain John Terry can't hold back the tears after Chelsea's Champions League semi-final exit
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Chelsea: The latest match pictures Chelsea 1 Atletico Madrid 3 Arda Turan celebrates after soring Madrid's third
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Chelsea: The latest match pictures Chelsea 1 Atletico Madrid 3 Diego Costa scores from the penalty spot
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Chelsea: The latest match pictures Chelsea 1 Atletico Madrid 3 Jose Mourinho looks on from the sidelines
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Chelsea: The latest match pictures Chelsea 1 Atletico Madrid 3 Fernando Torres celebrates scoring the opening goal with Cesar Azpilicueta
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Chelsea: The latest match pictures Chelsea 1 Atletico Madrid 3 Fernando Torres holds up his hands after scoring, showing respect to beloved former club
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Chelsea: The latest match pictures Liverpool 0 Chelsea 2 Willian has the simplest of finishes to make it 2-0 for Chelsea
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Chelsea: The latest match pictures Liverpool 0 Chelsea 2 Demba Ba celebrates his goal
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Chelsea: The latest match pictures Liverpool 0 Chelsea 2 Demba Ba scores for Chelsea after Steven Gerrard's slip
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Chelsea: The latest match pictures Liverpool 0 Chelsea 2 Steven Gerard and Jon Flanagan try to retrieve the ball from Jose Mourinho
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Chelsea: The latest match pictures Liverpool 0 Chelsea 2 Tomas Kalas, on his Premier League debut, tackles Raheen Sterling
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Chelsea: The latest match pictures Chelsea 1 Sunderland 2 Sunderland striker Fabio Borini, on loan from Liverpool, scores the winning goal from the penalty spot to hand Jose Mourinho his first Premier League defeat at home
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Chelsea: The latest match pictures Chelsea 1 Sunderland 2 Adam Johnson has a shot at goal
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Chelsea: The latest match pictures Chelsea 1 Sunderland 2 Connor Wickham wheels away after scoring the equaliser
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Chelsea: The latest match pictures Chelsea 1 Sunderland 2 Connor Wickham taps in from close range to level for the Black Cats after Mark Schwarzer spills a shot
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Chelsea: The latest match pictures Chelsea 1 Sunderland 2 Samuel Eto'o celebrate his goal
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Chelsea: The latest match pictures Chelsea 1 Sunderland 2 Samuel Eto'o fires past Vito Mannone to give Chelsea the lead
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Chelsea: The latest match pictures Chelsea 1 Sunderland 2 Ramires and Jack Colback battle for the ball
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Chelsea: The latest match pictures Swansea City 0 Chelsea 1 Jose Mourinho appeals for the final whistle
Chelsea: The latest match pictures Swansea City 0 Chelsea 1 John Terry applaud the travelling fans at the end of the match
Chelsea: The latest match pictures Swansea City 0 Chelsea 1 Samuel Eto'o's shot goes wide
Chelsea: The latest match pictures Chelsea 2 PSG 0 Jose Mourinho (second from right) celebrates with his players after Demba Ba (bottom left) scored the crucial second goal in the 2-0 win over PSG
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Chelsea: The latest match pictures Chelsea 2 PSG 0 Demba Ba scoops the ball into the roof of the net to send Chelsea through on away goals
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Chelsea: The latest match pictures Chelsea 2 PSG 0 Schurrle is congratulated after scoring Chelsea's first goal
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Chelsea: The latest match pictures Chelsea 2 PSG 0 Eden Hazard is taken off
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Chelsea: The latest match pictures Chelsea 2 PSG 0 Thiago Silva competes for the ball at Stamford Bridge
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Chelsea: The latest match pictures Chelsea 3 Stoke 0 Willian celebrates his goal as Chelsea run out easy winners
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Chelsea: The latest match pictures Chelsea 3 Stoke 0 Brazilian attacker Willian curls in Chelsea's third
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Chelsea: The latest match pictures Chelsea 3 Stoke 0 Frank Lampard celebrates after scoring the rebound from his saved penalty
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Chelsea: The latest match pictures Chelsea 3 Stoke 0 Frank Lampard scores the rebound after Asmir Begovic saves his penalty
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Chelsea: The latest match pictures Chelsea 3 Stoke 0 Andy Wilkinson brings down Mohamed Salah in the box and gives away a penalty
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Chelsea: The latest match pictures Chelsea 3 Stoke 0 The Egyptian winger Mohamed Salah celebrates his goal
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Chelsea: The latest match pictures Chelsea 3 Stoke 0 Mohamed Salah smashes home the Blues' opening goal
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Chelsea: The latest match pictures PSG 3 Chelsea 1 Salvatore Sirigu makes a clearance with Oscar bearing down in this Champions League quarter-final
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Chelsea: The latest match pictures PSG 3 Chelsea 1 Ezequiel Lavezzi celebrates after scoring the opener
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Chelsea: The latest match pictures PSG 3 Chelsea 1 Zlatan Ibrahimovic pictured during the first-leg victory for the French side
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Chelsea: The latest match pictures PSG 3 Chelsea 1 Petr Cech shows his frustration
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Chelsea: The latest match pictures PSG 3 Chelsea 1 Cesar Azpilicueta is challenged by Edinson Cavani
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Chelsea: The latest match pictures PSG 3 Chelsea 1 Eden Hazard scores from the spot to make the score 1-1
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Chelsea: The latest match pictures PSG 3 Chelsea 1 Javier Pastore (bottom left) is mobbed by his team-mates after his late strike made it 3-1
Chelsea: The latest match pictures Crystal Palace 1 Chelsea 0 John Terry walks off the pitch after his own goal gives Crystal Palace the points
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Chelsea: The latest match pictures Crystal Palace 1 Chelsea 0 Jose Mourinho tells off a Palace ball boy for time wasting
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Chelsea: The latest match pictures Crystal Palace 1 Chelsea 0 John Terry can't believe what he has done as his own goal puts Palace in front
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Chelsea: The latest match pictures Crystal Palace 1 Chelsea 0 John Terry heads into his own net
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Chelsea: The latest match pictures Crystal Palace 1 Chelsea 0 Nemanja Matic tackles Mile Jedinak
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Chelsea: The latest match pictures Chelsea 6 Arsenal 0 Arsene Wenger complains to the referee during an awful day on his 1000th game in charge of Arsenal
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Chelsea: The latest match pictures Chelsea 6 Arsenal 0 Mohamed Salah celebrates after scoring his first goal for Chelsea and his side's sixth on the day
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Chelsea: The latest match pictures Chelsea 6 Arsenal 0 Chelsea players celebrate as Tomas Rosicky looks away
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"What happened in the defeat against Villa I never learn, I never accept.
"Somebody was very successful in putting a hurdle in front of us. And we crashed the hurdle against Aston Villa and we lost.
"Villa was not a normal football match and we always hope that football matches are normal."
Mourinho will face a personal Football Association disciplinary hearing at the end of next week to challenge his improper conduct charge issued following his dismissal at Villa.
"If you lose in the right way you have to move on and try not to lose again," said Mourinho, who faces a £10,000 fine for his second sending-off of the season.
"The only thing I didn't learn is to lose with that kind of referee performance, because it's not a mistake, it's a performance.
"I learn to control my emotions and I learn to calm down in the moment like I did, but I don't learn how to accept that kind of performance."
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