San Antonio Spurs rookie guard Dylan Harper suffered a left calf strain during Sunday's loss to the Phoenix Suns, the team said Monday.
Though the Spurs did not list a timetable for the injury, sources told ESPN's Shams Charania that Harper is expected to sit out multiple weeks.
Harper suffered the injury while defending a Nick Richards dunk in the second quarter of a 130-118 loss to the Suns.
After falling awkwardly on a block attempt, Harper winced after walking toward the bench. Upon checking out, the rookie headed to the locker room with a member of San Antonio's medical staff and was later ruled out. He was seen leaving the arena after the game in crutches and a walking boot.
An MRI on Monday revealed the strain.
The Spurs are already without veteran point guard De'Aaron Fox, who hasn't played in a game this season because of a hamstring injury suffered during the summer before training camp.
Harper, 19, played a total of 11 minutes against the Suns and contributed 12 points on 5-of-8 shooting. The No. 2 pick entered the game fourth on the team in scoring (14.4), also averaging 4.6 rebounds, 2.4 assists and 1.2 steals in five games.
"Yeah, I hope the best for him, for sure," Victor Wembanyama said of Harper after Sunday's game. "We've seen great things from him. It's actually been hard to believe how good he's played. But it happens. We have to be able to deal with injuries. But at the same time, we're going to get some guys back."
San Antonio next plays Wednesday at the Los Angeles Lakers.
ESPN's Michael C. Wright contributed to this report.