Goalkeeper Colin Doyle has penned a new two-year contract at Birmingham.
Birmingham winger Nathan Redmond has been included in Peter Taylor's provisional England squad for this summer's Under-20 World Cup.
Ryan Higgins has put pen to paper on his first professional contract with Birmingham.
Birmingham City have reportedly agreed a deal to sign Motherwell goalkeeper Darren Randolph on a free transfer.
Birmingham teenager Mitch Hancox has signed a new three-year contract with the club.
Birmingham defender Curtis Davies believes he proved himself in the second half of the season following a January full of speculation.
Birmingham have released Keith Fahey, Morgaro Gomis, Steven Caldwell, Pablo Ibanez and Adam Rooney from the club as they prepare for another Championship campaign.
Birmingham have completed the signing of young midfielder Olly Lee on a free transfer from Barnet.