Carling Cup - Fabregas out of Cup final
The Arsenal captain lasted just 14 minutes before being replaced by Andrei Arshavin.
“It is a very small injury but certainly Cesc will be out for Sunday,” Arsène Wenger told the official club website. “For how long [beyond that] I don’t know but definitely for Sunday.
“He is disappointed. We all feel sorry and sad for him. The only way we help him now is to win the Carling Cup as he contributed a lot in this competition.”
But Wenger would not be drawn on the chances of the midfielder being fit to face Barcelona in the Champions League return leg on March 8.
“It is very difficult to give a deadline,” said Wenger. “It is impossible.”
Theo Walcott will also miss the Wembey showpiece after being stretchered off in the same game with an ankle sprain.
“I saw him this morning,” said Wenger. “He has a classic ankle sprain. We don’t think there is any more damage to it. But it is still a sprain. We are sad for him too. He is out for Sunday and maybe one or two more weeks more.”