The team is expected to rule out Parker for the rest of the playoffs and schedule a procedure based on the outcome of the MRI exam, league sources said.
On Wednesday, France's Parker became the ninth player in playoff history to reach 4,000 career points.
His 10.1 points per game in the regular season was his lowest average since his rookie year in 2001-02. Houston led by two points at the end of the ugly first quarter, but San Antonio eventually took over the game and held control throughout the second half despite several Rockets runs.
More from Yahoo Sports: • Red Sox fan gets lifetime ban for using racial slur • Just how bad was the Bears' Trubisky deal? Here's what he had told the Associated Press about his future Hall of Fame guard before the playoffs began: "If we don't have him, it's going to be a lot tougher to hang with teams like Houston and Golden State, the Clippers, that kind of thing". After the Spurs were blown out in Game 1, Parker responded with 18 points in 25 minutes before getting injured.
San Antonio Spurs star Tony Parker has undergone successful surgery to fix a ruptured muscle tendon but there is no timetable for his eventual return, the National Basketball Association team said Friday, May 5.
Juventus manager Allegri rules out move for Man Utd target Andrea Belotti
Adem Ljajic handed the visitors the lead after 52 minutes, before Gonzalo Higuain rescued the league leaders with the equaliser in stoppage time.
The Cavaliers are the only team since the Minneapolis Lakers in 1949 and 1950 to win their first seven playoff games in consecutive seasons. It makes me squirm even thinking about tearing the quad. We'll try to step up, but it is hard to lose a player like Tony.
"Just sucks to see anybody go down, no matter who it was", Toronto's DeMar DeRozan said Thursday, when asked about Lowry and how that will impact the Raptors going forward.
Backup Patty Mills will likely start in Parker's place for Friday night's Game 3 against the host Rockets.
San Antonio's trio of Kawhi Leonard, Pau Gasol and LaMarcus Aldridge did the bulk of the work, combining for 64 points. It also doesn't hurt the Spurs if James Harden is the one switching onto Leonard.
The Raptors have never won a playoff series when trailing 0-2 and are now a dismal 1-6 in game two's on the road.
"You find somebody to stop LeBron in these moments, I'll give you $100", Toronto's DeMar DeRozan said.