Vieira aggravated an injury in his right thigh during his team´s 2-1 triumph in the Champions League at CSKA Moscow on Tuesday. The Frenchman only recently returned from a thigh problem that kept him out of action for almost a month.
"We are saddened by Vieira´s latest injury," said Mancini. "But these things can happen in football when you come back from a long injury. It´s a pity because Vieira is a champion and for us he is really important."
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