Arsenal captain Cesc Fabregas is a doubt for the Gunners'mouth-watering clashes with Manchester United and Manchester City, aftersustaining a hamstring injury.
The Spaniard could be out for up to three weeks after being broughtoff at half-time during the 4-1 demolition of Portsmouth at theEmirates Stadium on Saturday.
Fabregas is almost certain to miss Arsenal’s midweek ChampionsLeague qualifier second-leg against Celtic, and will face a fitnesstest on Monday to evaluate the seriousness of the injury.
"'Cesc has a hamstring problem. He will be short for Wednesday certainly," said manager Arsene Wenger.
“He is not definitely out, he thinks it is not [too bad]. If it is alittle pull he will be out for three weeks, if it is just tightnessmaybe he can get away for Wednesday.
"But we will see. In 48 hours wewill have a better view.”
The Gunners are already without a string of first team playersthrough injury, including Theo Walcott, Tomas Rosicky, Samir Nasri,Johan Djourou and Lukasz Fabianski.
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