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| Norwich's Grant Holt hooks in the equaliser past a bemused Hilario |
Debutant Juan Mata scored deep into injury time as Chelsea left it late to secure an unconvincing victory over 10-man Norwich.
The Blues led through Jose Bosingwa's stunning 25-yard shot but Grant Holt levelled after a blunder by Hilario.
Frank Lampard's penalty made it 2-1 after Ramires was felled by keeper John Ruddy, who was sent off.
Mata slotted in to seal the win but Chelsea's day was marred by a head injury to Didier Drogba.
Drogba took a heavy whack in the face from Ruddy and crashed to the floor with the scores at 1-1, as the keeper looked to punch clear a teasing cross.
The big Ivorian laid motionless on the pitch and was finally taken off on a stretcher after lengthy treatment which resulted in 11 minutes of injury time.
Villas-Boas concerned over Drogba injury
Drogba needed a breathing aid and was taken to hospital, leaving the Blues with an anxious wait to discover the extent of the injury.
Lampard restored Chelsea's lead and in those 11 minutes of added time, Mata finally gave the hosts breathing space to end the visitors' hopes and cap a pulsating and eventful match.
But Chelsea's fans were no doubt hoping that - following their tense victory over West Brom last Saturday - Bosingwa's fabulous early strike would be the prelude to a routine win.
Despite a blistering start in which Ramires saw a fine, long-range effort tipped wide by Ruddy, Norwich posed a serious threat in an open and entertaining game and could easily have snatched all three points themselves.
