Dutch midfielder Nigel De Jong has suffered a ruptured Achilles tendon injury that will rule him out for the rest of the season, according to AC Milan coach Massimiliano Allegri.
De Jong pulled up after Milan had scored their fourth goal in a 4-2 away win at Torino on Sunday and limped off the pitch.
Speaking to Mediaset channel after the game, Allegri said: "The lads have dedicated the victory to Nigel, who unfortunately has suffered a ruptured Achilles tendon injury that will see him out for the season."
De Jong was one of several names to join AC Milan in a summer which saw the seven-times European champions lost the spine of their squad including Zlatan Ibrahimovic.
After going a goal down to Argentinian Mario Santana, Milan scored four through Robinho, Antonio Nocerino, Giampaolo Pazzini and Stephan El Shaarawy before Rolando Bianchi scored a late consolation for the Granate.
Milan's sixth win leaves them seventh in Serie A on 24 points, 14 behind leaders and champions Juventus.