AC Milan have signed left-back Urby Emanuelson from Ajax, the Serie A club confirmed today.

Emanuelson has signed a contract with I Rossoneri until 30 June 2014.

The 24-year-old Dutch international is Milan's second reinforcement in the winter transfer market following the arrival of Antonio Cassano from Sampdoria earlier this month.

They had been looking to strengthen their defensive line with Gianluca Zambrotta out injured and Luca Antonini having failed to impress AC Milan coach Massimiliano Allegri at left-back.

Milan had previously seen bids for Sampdoria left-back Reto Ziegler and Genoa defender Domenico Criscito turned down.