Serie A leaders AC Milan signed Ajax left wingback Urby Emanuelson on a permanent deal yesterday to increase their defensive and midfield options for the title run-in.

"AC Milan announce the purchase from Ajax of Urby Emanuelson, who has signed a contract until June 30, 2014," a club statement said without adding any financial details.

Dutch media reports said Ajax would receive 1.7 million euros (US$2.38 million) for the player.

With Gianluca Zambrotta injured and Luca Antonini inconsistent at left back, the 24-year-old Dutch international will provide competition in Milan's defence but could also be used further forward in Massimiliano Allegri's 4-3-3 formation.

Emanuelson, who at first was due to head to Milan on a Bosman free transfer this July before a deal was struck for his immediate transfer, is a product of Ajax's youth system and played against the Rossoneri in a Champions League win at the San Siro in December.