"Kawhi has made significant progress and continues to move forward in his rehabilitation," Spurs general manager R.C. Buford said in a statement. "This is the best approach for the next steps in his return to play."
Greg Popovich said the Spurs expect Leonard to play again this season, according to Jeff McDonald of the San Antonio Express-News.
Leonard didn't make his 2017-18 debut until San Antonio's 95-89 loss to the Dallas Mavericks on Dec. 12. The team was careful about limiting his playing time as he got back into the swing of things, but the quad injury persisted.
San Antonio has shown it can at least remain near the top of the Western Conference without Leonard. Despite his appearing in just nine games so far, the Spurs are third in the West, seven games back of the first-place Golden State Warriors.
LaMarcus Aldridge deserves a lot of credit for that. He's averaging 22.4 points and 8.5 rebounds, and he's playing by far his best since signing with San Antonio in 2015. The Spurs will need him to continue that level of performance until Leonard returns.
Still, the team's title hopes rest largely on Leonard's availability. Although a few months remain until the playoffs get underway, Wednesday's update is about as close to a worst-case scenario as possible for the Spurs.