Juventus' Andrea Pirlo (R) shoots the ball as he is followed by FC Copenhagen's Rurik Gislason during their Champions League soccer match at Juventus stadium in Turin November 27, 2013 (Photo: Reuters)
Juventus said in a statement that the 34-year-old Italian international, who limped off in the first half of Sunday's 1-0 win over Udinese, had undergone tests on Monday.
"These findings have shown the player has suffered a grade two injury of the medial collateral ligament (MCL) of the right knee," the Serie A leaders added.
The club did not give further details but media speculated that Pirlo, who has led Juventus to two successive Serie A titles in his first two full seasons with the team, would be sidelined until January.
(For more sports news and updates, follow Ahram Online Sports on Twitter at @AO_Sports and on Facebook at AhramOnlineSports.)
Short link: