By Chris Harris

Samir Nasri is expected to be out for three weeks after suffering a hamstring injury on Sunday.

The French international pulled up while chasing a through-ball during the first half of Arsenal's 2-1 win over Huddersfield Town and was immediately replaced by Tomas Rosicky.

"Nasri looks to have a serious hamstring injury," confirmed Arsène Wenger after the game. "Usually it is three weeks [out], we have to see if it is a Grade One [strain] because that can be two [weeks].

"It is a big blow, how big I do not know because the results in the future will tell, but it is a big blow. Put three weeks to today's game and you will know [if he misses the Barcelona game]. I think yes."

Wenger made seven changes to his team for the FA Cup Fourth Round tie at Emirates Stadium but Nasri was a surprise starter. The manager explained why during his post-match press conference.

"I have regrets now, yes, because the plan was first to play Rosicky but he was still too weak because he was sick," said Wenger.

"So I took the gamble on Nasri and it back-fired but he could have come on and because it was after 25 or 30 minutes it could have happened as well if he comes on. It is difficult to predict but of course we are at the stage of the season that we play so many games that to lose bodies is very difficult for us."

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30 Jan 2011