Tracy McGrady left the Rockets-Thunder game on Monday night in the first minute of the second half after re-aggravating his troublesome left knee, the Associated Press is reporting.

It was the same knee that was operated on this offseason to have loose bodies removed. He didn't return.

"Tonight I went back to square one, even before surgery, is how my knee is feeling right now," McGrady said.

"I want to play, man. I want to play. Just to get off to this start, for me personally this is a bad start," McGrady said. "To have to play your way through an injury that I've never had before and a surgery that was my first surgery is very frustrating. My game is really based on athleticism, and that's something that I don't have right now."