SAN ANTONIO -- San Antonio Spurs coach Gregg Popovich revealed Wednesday that injured forward Tim Duncan underwent an MRI on his sore right knee and said Duncan would undergo a regimen of rest and rehabilitation.
Popovich declined to place a timetable on Duncan's return.
"I don't do timetables," Popovich said. "They never work, because [the situation becomes], 'But you said it was gonna be [ready].' When he's ready, he's ready."
Duncan was not in the lineup for Wednesday's 130-99 rout of the Houston Rockets.
Duncan's absence is his third in San Antonio's past four outings. The Spurs held Duncan out of the team's 120-90 loss to the Golden State Warriors on Monday, and he also missed last Thursday's win over the Phoenix Suns before returning for a 108-95 win on Friday over the Los Angeles Lakers.
Duncan traveled with the Spurs to Oakland, California, to face the Warriors, but the team sent him back to San Antonio to nurse the injury.
Popovich declined to say whether doctors found anything concerning in the results of Duncan's MRI.
"They're rehabbing him and doing what they do," Popovich said. "Unlike you, I'm not the doc. They just tell me when he's ready to go."
With Duncan out of the lineup against the Warriors, David West filled in as the starter, contributing 12 points and five rebounds in 19 minutes.
West was expected to fill in as a starter again Wednesday, but Popovich instead opted for a frontcourt of Kyle Anderson, Kawhi Leonard and LaMarcus Aldridge to counter the Houston Rockets' small lineups. Aldridge scored a game-high 25 points with 10 rebounds, while Leonard contributed 18 points on 7-for-12 shooting.