AS Monaco have confirmed Radamel Falcao needs knee surgery.

Falcao, a target for Chelsea, Manchester United and Real Madrid, will undergo surgery on a left knee injury, his Ligue 1 club Monaco said on Thursday without elaborating on the length of his absence.

"Radamel Falcao suffered a lesion on his left knee's cruciate ligament. Surgery is necessary... the doctors will do everything they can to help Radamel Falcao recover as quickly as possible," Monaco said in a statement.

EFE says the 27 year-old Colombian will be out for six months jeopardizing his chances of competing at the World Cup in Brazil in June.

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