Seven things we learnt from the Premier League this weekend: Petr Cech concern, Jose Mourinho the Quiet One, Manchester United must gel

A look back at the key lessons from Saturday and Sunday, including Newcastle's new hero and why the season could be unpredictable

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This season could be more unpredictable than ever

Chelsea, Everton and Arsenal have been quick to discover that relatively simple looking fixtures might not be as easy as they seem. All three dropped points when they might have expected to win. With Leicester scoring four goals as well, it seems this season could be one for unpredictable results and a year where no game is over before it's over.

Petr Cech might not be the icing Arsenal need on their cake

The lack of football over the summer has been filled with the sound of Arsenal supporters cooing over their signing of Petr Cech. Snatching the goalkeeper from London rivals Chelsea is undoubtedly a great bit of business. But his errors in the 2-0 defeat to West Ham suggest he might not be the superhero he's been billed as.

Petr Cech on his Arsenal debut (GETTY IMAGES)

Newcastle might have found a new hero

Newcastle fans love a moan - but not as much as they love a hero. And they might have found one in Georginio Wijnaldum. The new boy was a solid presence throughout the 2-2 draw with Southampton, marshalling the Magpies' midfield and exuding plenty of promise for the season ahead. His goal - a powerful header from Gabriel Obertan's 48th minute cross - was everything he deserved for an impressive performance.

Gini Wijnaldum celebrates after putting Newcastle ahead (GETTY IMAGES)

Jose Mourinho won't be the Quiet One for long

There was lots to talk about after Chelsea's entertaining 2-2 draw with Swansea, not least the red card shown to Thibaut Courtois after the goalkeeper brought down Betafomi Gomis. But Jose Mourinho refused to express his view on the pivotal moment in the match. But he did at least hint that we can expect more from the Chelsea manager as the season goes on. "First game of the season, I don't want to start in the first game," he said.

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Manchester United are far from the finished product

Manchester United might have won, but their performance against Tottenham was disjointed and sluggish. Louis van Gaal started four new players from the beginning in Matteo Darmian, Sergio Romero, Memphis Depay and Morgan Schneiderlin, whilst Bastian Schweinsteiger came off the bench. It always takes a while for new signings to gel, but they will need to do so quickly because if United continue to play as they did on Saturday, they won't be escaping with three points every week.

Sergio Romero in goal for Manchester United (GETTY IMAGES)

Claudio Ranieri is a fan of rock

The performance of the weekend aside from West Ham's display at the Emirates belongs to Leicester. Three first-half goals and a 4-2 win over Sunderland were a brilliant start to the season for a side many have tipped for the drop. Manager Claudio Ranieri, whose appointment many questioned, revealed what inspired the win. "I think I know the Leicester fans very well," said the Italian. "They are [passionate] supporters and I told my players, 'When you go on the pitch and you hear the song from Kasabian, that means they want warriors. Kasabian are a fantastic rock band from Leicester and I think the guitar man, Serge, is Italian." Rock on.

New boss Ranieri got off to the best possible start at Leicester (Getty)

Promoted teams could struggle

Bournemouth and Norwich both lost at home on the opening day - to Aston Villa and Crystal Palace. Both were games that if either is to survive the drop, they must be picking up points from. Bournemouth's defeat was narrow whilst Norwich were incredibly unlucky to have what appeared a legitimate goal from Cameron Jerome chalked off. But those are the fine margins of the Premier League. Watford though showed real promise in their game at Goodison Park - but the 2-2 result was possibly a greater indicator of the problems Everton could have this season.