David Murphy will remain at Birmingham for a further two years after an extension clause in his contract was activated.
Caleb Folan has joined Championship promotion chasers Birmingham on a free transfer until the end of the season.
Lincoln defender Cian Hughton has signed a new contract to keep him at Sincil Bank until 2011.
Lincoln are confident Cian Hughton is close to signing a deal to stay at the club until the end of the season.
Cian Hughton hopes to secure his future at Lincoln after opening contract talks with manager Chris Sutton.
Watch every goal from every game in the Football League
© 2014 BSkyB