He was rested from Saturday’s trip to Ipswich Town and may not reappear for Tuesday’s encounter against Newcastle United at the Lane.
Carr explained: “It’s a groin injury that has been niggling for the last game and a half or so.
“It looks like there might be a bit of damage in there and it might need a little time to settle down.
“I had it when I played against Middlesbrough and it was sore but I came through the game. But at Southampton it just wasn’t right. I couldn’t sprint and that is a key part of my game.
“If I can’t get up and down I’m not doing any justice to myself or the team.
“But I don’t think I will need an operation. That’s a new one for me. Perhaps just a rest will do it but I’ll wait to see how it goes.”
The hectic festive season of four matches in 10 days has not helped Carr’s cause.
He added: “The games coming thick and fast and that’s the problem. I might have been able to rest it in-between Saturday matches but we have three matches in a week at the moment.
“Over the last two games I haven’t felt right. I felt as if I just couldn’t push myself.
“It’s been a good year for me overall and hopefully I can put this injury aside and get back into the team.”
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Time could be the best healer for Stephen Carr.