MILAN (Reuters) -- AC Milan midfielder Mathieu Flamini has been ruled out for up to four weeks with a knee injury while defender Thiago Silva has a similar injury, the Serie A leaders said on Thursday.

"The prognosis is three to four weeks," a club statement said about Frenchman Flamini.

A separate statement said Brazil's Thiago Silva had undergone a scan and it had been agreed he visit the Brazil national team doctor in Rio de Janeiro for a consultation.

The pair injured their knees in Wednesday's 2-0 Champions League defeat by Ajax Amsterdam, a dead game for already-qualified Milan in which coach Massimiliano Allegri rested several first teamers.

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