Notre Dame offensive guard Trevor Robinson has a low-ankle sprain and could miss this weekend's game against Navy.
Robinson injured his ankle in the first half of Saturday's 40-14 victory over Washington State.
"He'll miss some time," coach Charlie Weis said during his Sunday news conference. "I don't know if he'll play this week or not. … I'd list him as doubtful. But there's a big difference between a low-ankle sprain and a high-ankle sprain."
Weis said defensive end Kapron Lewis-Moore, who also injured his ankle against Washington State, was looking better Sunday.
"When I saw him walk in the locker room (Saturday night), I was going to ask him if he wanted me to carrying him out to the bus," Weis said. "When I saw him walk into the team room (Sunday), he hardly had a limp. If you asked me odds (Sunday), I would probably say he is questionable and probable by Tuesday."
As for backup quarterback Dayne Crist, who injured his right knee Saturday, Weis said Crist is still scheduled for an MRI on Monday.
"We're cautiously optimistic that it's not as bad as we originally thought it was," Weis said. "We're keeping our fingers crossed on that one. He was tested (Sunday), and the knee was a lot more stable than we thought it would be. There's a chance it will be better than we thought it would be, but we'll wait for the test."
Weis said he should also get an update on the possible return of receiver Michael Floyd on Monday. Floyd will have a CAT scan and Weis said he expects to get the results of the test Monday night and will update the media on the receiver's status Tuesday.