Sky Sports understands Wolves and Burnley are tracking out-of-contract Birmingham defender Stephen Carr.
Carr's deal at St Andrew's expires this summer and the right-back is yet to pen a new contract with Blues.
Birmingham's Championship rivals Wolves and Burnley are both thought to be monitoring the 35-year-old, who arrived at the Midlands club from Newcastle in 2009.
The defender, who enjoyed league cup success with the Blues the season before last, saw the second half of his most recent campaign disrupted by a knee injury.
But Carr has previously said he is not thinking of retirement and is keen to play on.