AC Milan have completed the signing of Espanyol defender Didac Vila.

The 21-year-old is Milan's fourth signing of the transfer window after Antonio Cassano, Urby Emanuelson and Mark Van Bommel. Asked about Milan's latest signing, coach Max Allegri said: "He is a young full-back with good feet, a lot of running and a good physical structure."

Didac Vila completed a medical yesterday before signing a four and a half year contract.

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