All-Pro wide receiver Larry Fitzgerald was to have an MRI on his injured right knee but he indicated on his Twitter account that he is "sore but OK."
Arizona coach Ken Whisenhunt said on Tuesday that the MRI was a precaution and that he was encouraged that Fitzgerald was able to go back in the game after he was injured in Monday night's 24-9 loss at San Francisco.
"The only thing I'll say is we took him off the field last night because he fell awkwardly, obviously his leg got bent back, more as a precautionary thing just to make sure," Whisenhunt said. "The doctor felt good enough about him to come back and allow him to do that. I was encouraged that he finished."
Fitzgerald was hurt on the third play of the third quarter when the 49ers' Dashon Goldson landed on his leg on a deep pass attempt. Fitzgerald was helped off the field, then went to the locker room. He returned to the game with 3:23 to play. The initial diagnosis was a sprained knee.
Fitzgerald said on Twitter on Monday night that he was "sore but OK." Asked again on Tuesday, he answered he was "sore but straight."
Whisenhunt said safety Michael Ware did not have a torn ACL as was initially feared. Whisenhunt said it is uncertain how much damage Ware had in the knee and when he might return.
"We're fairly certain that it's not an injury that requires an operation, which is a good thing," the coach said.
Kicker Neil Rackers aggravated a nagging groin injury. Whisenhunt said the cool, damp conditions at Candlestick Park were a factor in Rackers' problems.
"We're obviously going to have to assess him and see where it is and if he can continue in this cycle or how we go from there," Whisenhunt said.
If a new kicker is needed for Sunday's game at Detroit, the addition wouldn't have to be made until later in the week, Whisenhunt said.
"You want him to be able to get some reps with the holder, with Ben (Graham)," Whisenhunt said. "It's not as critical as another position where you have to learn a game plan and everything that's involved with that."
Offensive tackle Mike Gandy continued to have problems with a pelvic injury. He started the game but was replaced by Jeremy Bridges in the fourth quarter.