A scrappy opening period saw few chances but it was the visitors who threatened more, Sergio Aguero missing a great opportunity when put through one on one. Before his injury you'd have backed the striker to score, but it's now five without a goal for him after he fired wide.
Loic Remy broke the deadlock after Branislav Ivanovic found Eden Hazard free on the left to volley a pass first time into the path of the French striker.
But City hit back almost immediately, Thibaut Courtois making a crucial error to mistime a cross that fell to the feet of Aguero. He shot but it needed the crucial touch of David SIlva to guide it past Ivanovic standing on the line.
Chances became even more scarce after the break and with Diego Costa and Cesc Fabregas missing, Mourinho opted to shut up shop and hang on for a 1-1 draw to maintain his five point lead at the top of the Premier League.
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Chelsea vs Manchester City player ratings
Chelsea vs Manchester City player ratings
1/23 Thibaut Courtois - 4
Horrendous mistake for the first goal, completely mistiming his punch. Was solid in every other part of his game but matches of this magnitude are often won and lost on the small details.
2/23 Branislav Ivanovic - 6
Terrible first half performance that included three terrible errors that, fortunately for Chelsea, went unpunished. Made up for that with a brilliant pass to find Hazard for the goal and was much better after half-time.
3/23 John Terry - 7
Made one bad error when he got underneath a long ball to allow Aguero through on goal but again proved he is the best English defender out there.
4/23 Kurt Zouma - 8
Still has huge room for improvement but the 20-year-old has all the tools to become one of the very best in the world. Deserves to be keeping England's first-choice centre-back on the sidelines.
5/23 Cesar Azpilicueta - 5
Jesus Navas had the better of his compatriot all evening. Azpilicueta was beaten in a way Chelsea fans have not often seen.
6/23 Nemanja Matic - 8
Stepped up his game in the absence of Fabregas to put in a complete midfield performance. Truly great on and off the ball, the giant Serbian was the best player on the park.
7/23 Ramires - 7
Held his position well as the holding midfielder and only made the occasional burst forward, Ramires was very good but its hard to argue that the Blues missed the wizardry of Cesc Fabregas.
8/23 Willian - 5
Hassled and harried his way through the 90 minutes, Willian was excellent in the defensive and middle thirds of the field but produced little to nothing in areas where he could do damage. Set-pieces delivery was also poor.
9/23 Oscar - 6
Another who failed to produce in the final third, Oscar played deeper than he has done for the most part this season which blunted his effectiveness
10/23 Eden Hazard - 6
Brilliant in the first 45, causing all sorts of problems for Bacary Sagna but was extremely quiet after the break as City closed off the space around the dangerous Belgian.
11/23 Loic Remy - 7
Was brilliant in the lone striker role, holding the ball up well to bring his team-mates into the game. Great movement to find space for the goal, it was a shame for Chelsea that the trio behind him starved the striker of service.
12/23 Joe Hart - 6
Nothing he could do about the goal and was hardly tested otherwise by the home side. Looked reasonably solid throughout, bar one dodgy kick.
13/23 Bacary Sagna - 6
Struggled in the first half against Hazard but grew into it as it went on, to snuff out the Hazard threat. Combined excellently with Jesus Navas. Lost Hazard for the goal.
14/23 Vincent Kompany - 7
Defender manfully, though he wasn't always the most comfrotable in possession. In truth, Chelsea didn't offer much threat.
15/23 Martin Demichelis - 7
Had an excellent match but went to sleep to allow Loic Remy to steal into yards of space for the goal.
16/23 Gael Clichy - 8
Didn't put a foot wrong on the left and never gave Willian the chance to do anything of note in the final third. Offered a good outlet going forward as well.
17/23 Fernandinho - 7
Was one of the best City performers with a display full of energy and purpose. Pushed the visitors forward, passed well and was not averse to stopping Chelsea by any means necessary.
18/23 Fernando - 7
Gave Matic as good as he got in midfield and provided the City defence with superb cover throughout the game.
19/23 Jesus Navas - 7
Gave Cesar Azpilicueta the hardest game he's played all season but for all the occasions he beat his opposite number he failed to deliver that telling ball.
20/23 James Milner - 7
Barely troubled Ivanovic as an attacking force but you can't downplay his importance to the City cause as a worker and defender.
21/23 David Silva - 7
Was not able to offer his usual craft when in possession as he was well marshalled by Matic and Ramires, but got an absolutely vital touch to turn Aguero's shot past Ivanovic.
22/23 Sergio Aguero - 5
Five games since returning from injury and the usually lethal striker is misfiring. Latched on to a Terry mistake to race through on goal for a chance that a pre-injury Aguero would have tucked away - he fired wide.
23/23 Frank Lampard - 5
The stage looked set for another Lampard goal against his former club but it was not to be. Given a great ovation at the end from his former supporters.