Daniel Gafford suffered a sprained ankle during the opening practice of Dallas Mavericks training camp on Tuesday.
Gafford is expected to miss the next 2-3 weeks. The Mavs open their season on October 22 against the Spurs.
Gafford missed the final two months of last season due to a Grade 3 sprain of the MCL.
Gafford signed a three-year, $54 million contract extension over the offseason.