The San Antonio Spurs will once again be without starting centre Tim Duncan when they host the Orlando Magic on Monday.

Duncan, 39, has played just 21 minutes (January 22 against the Los Angeles Lakers) in the Spurs' past five games while nursing a sore right knee.

During that time, San Antonio have lost games against the Golden State Warriors and Cleveland Cavaliers by lopsided margins.

The Spurs were out-rebounded 43-32 against Cleveland on Saturday.

Duncan, a veteran in his 19th NBA season, is averaging 8.9 points and 7.5 rebounds per game this campaign.

It is still unclear when Duncan can return.