The 33 year-old was substituted at half-time during his team's goalless draw with the Black Cats at the Stadium of Light and was replaced by second-choice shot-stopper Robert Green.
|WE WERE BOTTOM WHEN I TOOK OVER...WE STILL ARE|
|15/8||QPR are 15/8 with Bet365 to finish bottom of the Premier League|
"He did his groin. He tore a groin. He's a good pro, I've been impressed with him as a fella and can see why he's played at the very, very top," he told reporters.
"Rob Green made a great save when he came on, so we're lucky there we've got two great keepers."
The 0-0 draw against Martin O'Neill's side away from home was only the fifth point that the Hoops' have managed to pick up in their fourteen league games so far and they remain rooted to the bottom of the table, eight points from safety.