Arsenal defender Gabriel Paulista has been ruled out for two to three weeks with a hamstring problem. The Brazilian was injured in Wednesday's 2-1 Premier League win at QPR.
Arsenal face Manchester United on Monday in an FA Cup quarter-final.
"It's a special intensity because it's between two teams with a chance of winning," said Gunners boss Arsene Wenger. "We are the holders of the FA Cup and we want to keep it."
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