ROME (Reuters) -- AC Milan defender Alessandro Nesta looks set to be out of action until the new year after doctors confirmed the Italian centre back pulled a thigh muscle in Wednesday's Champions League defeat against Barcelona.

"AC Milan wishes to communicate that Alessandro Nesta underwent medical tests today which revealed a pulled muscle in his upper thigh," read a statement on Friday on the club's website ( "It is estimated that the player will be out for a month."

Currently third in Serie A, Milan, who have already qualified for the knockout stages of the Champions League, are scheduled to play five league matches before the winter break on Dec. 21, beginning with Sunday's visit of Chievo Verona.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.