McGrady had an MRI on Wednesday, two nights after he went 1-for-9 from the field in Houston's 124-112 loss in Milwaukee. He sat out most of January to rest his knee but said it's started to bother him again in the two weeks since he returned.
"The last couple of games, I've regressed," McGrady said during halftime of Wednesday's game. "I've felt pain."
The seven-time All-Star has missed a total of 17 games with soreness in the knee, the lingering effects of arthroscopic surgery last May. He visited renowned orthopedist James Andrews in December, after team doctor Tom Clanton said McGrady was suffering from general soreness in the knee.
"Everything's the same," McGrady said. "That's the problem."
The Rockets said McGrady is "expected to seek additional medical opinions in the coming days" and that his status will be re-evaluated after the All-Star break.
McGrady said he's optimistic about returning this season. He said no doctor has so far suggested that he should sit out the rest of the year to let the knee heal once and for all. McGrady said he would only consider more surgery as a last resort.
"I have to, for myself and for this team, fix the problem to where I don't have it anymore," McGrady said. "I'm just trying to get all the information I can, to try to get back."
The Rockets said before Wednesday's game that the MRI earlier in the day revealed "no change in his left knee from prior diagnosis." McGrady acknowledged that he's suffering from the same injury that's bothered him all season.
"We'll see what happens after the All-Star break," he said. "I've been getting some good news and getting some bad news, some different views. I'm confused."