Arsenal midfielder Abou Diaby will miss the weekend trip to Bolton Wanderers after picking up an injury in Wednesday's pulsating 3-3 derby draw with Tottenham Hotspur.
The 24-year-old Frenchman was replaced by Jack Wilshere after limping off midway through the second half at White Hart Lane with a calf injury.
Speaking in his press conference ahead of the Gunners visit to the Reebok Stadium, manager Arsene Wenger confirmed:
"Diaby looks to have a calf strain so he is out for Sunday and certainly is a big doubt for Manchester United," who Arsenal face on 1 May in a potential title-deciding fixture.
Wenger will be looking for an immediate response from his young side after letting slip a two-goal lead against Spurs.
A result which has seen Chelsea leapfrog the Gunners in the Barclays Premier League table, albeit only on goal difference.
The Arsenal boss was in vigorous mood at the Emirates Stadium this morning as he responded to comments from Blues goalkeeper Petr Cech, who has seemingly written off the north Londoners chances of winning the title.
"I'm quite open to everything but mathematically, and I was not bad at Maths, it's quite difficult to understand the logic of his statement," he said.
"You cannot say Chelsea are not the form team. But when they have the same number of points, mathematically I can't see a difference."