"It's another 24 hours," he said.
"X-ray pictures show everything is fine, no cracks. I think I will be fine."
Houston coach Rick Adelman said he has "no idea" when Yao will play again, saying he's day to day.
"He was hoping to play, but it's still a little bit sore and it's bothering him," Adelman said. "So, there's no reason to push him at this point.
"We'll see how he feels [Monday]."
The 7-foot-6 center left Friday night's game at Indianapolis because of a sore right knee and did not play after halftime.
McGrady has missed 16 games with a sore left knee, which underwent surgery in May, and Artest has been out 13 games with an injured right ankle.
Yao is averaging 19.6 points, 9½ rebounds and 1.7 blocks, missing only one game previous to Sunday night's matchup.
"I try to push it and [my foot] push back," Yao joked. "They want me to play the whole season and don't want me to rush."