Sporting Lisbon and U.S. defender Oguchi Onyewu has suffered a torn ligament in his right knee and will be sidelined two months, the Portuguese club announced Tuesday.

The 29-year-old Onyewu was injured in Sunday's 1-0 win over Pacos Ferreira and had to leave the match inside 30 minutes. Onyewu had five goals for Sporting, but could miss the rest of the season.

Onyewu suffered a knee injury in 2009 and struggled to regain form until this season with Sporting, but now faces another spell on the sidelines. He should be healthy in time for World Cup qualifying, which begins in June.