Defender Stephen Carr has signed a two-year contract to remain at Birmingham.
The 32-year-old former Newcastle player was tempted out of retirement by Blues manager Alex McLeish in February to sign a short term deal following an injury crisis.
The right-back played his part in Birmingham’s successful season to regain a spot in The Premier League.
“Carr has done well. His hunger has been superb ever since he arrived – he is a fully motivated player with the kind of quality that counts in The Premier League,” McLeish said on the club’s website.
“He is always positive and says the right things – he has got a winner’s attitude.
“Right-back was a problem position for us the whole of last season due to injuries. Nicky Hunt came in on loan and did a good job for us but then Bolton recalled him.
“But Carr came in and nailed the position. He’s vastly experienced and in the crucial closing stages of our quest for Premier League status that experience told.”