Birmingham have secured the services of defender Stephen Carr until the end of the season after he impressed during a one-month deal.
The full-back originally joined Blues in February and made his debut in the 0-0 draw at Crystal Palace.
Birmingham boss Alex McLeish decided to make the deal permanent after Carr featured in all six games since his arrival at the club.
McLeish told the club`s official website: "Stephen has brought a calmness and good positional, covering play to the back four.
"I never doubted his quality but a fear about the lack of games he had played this season before he arrived at the club has been dispelled by his performances."
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