Alex McLeish fears London rivals Arsenal, Chelsea and Tottenham are lining up bids for Birmingham defenders Roger Johnson and Scott Dann, according to the Metro.
The pair have been impressive since the Blues returned to the Premier League last season and are expected to command high bids.
Chelsea and Arsenal are the most probable destinations as their respective managers are likely to be active in the January transfer market.
Arsene Wenger has been disappointed with the way his new defensive recruits, Laurent Koscielny and Sebastien Squillaci, have adapted to life at the Emirates Stadium.
With Thomas Vermaelen injured and just Johann Djourou as back up, the Gunners boss is expected to be looking for reinforcements as soon as possible.
Meanwhile, Chelsea have recently seen their defensive options exposed since John Terry’s injury and have suffered back to back defeats for the first time since May 2006.
Johnson and Dann were part of the Birmingham side that defeated Chelsea this weekend – just a week after a humiliating 3-0 loss to Sunderland at Stamford Bridge.
Alex took painkillers to make sure he played in the game at St Andrews but desperately needs to undergo surgery, which would leave just Branislav Ivanovic, a right back by trade, and youngsters Jeffrey Bruma and Patrick van Aanholt as Chelsea’s more established centre backs.
Tottenham are less likely to make a move but boss Harry Redknapp is aware he needs to bolster this small squad at White Hart Lane if they are to challenge in the Premier League, Champions League and FA Cup successfully.