Town boss Mick McCarthy has made midfielder Anthony Wordsworth available for loan or permanent move. Meanwhile, ex-Blue Darren Ambrose is training back at Playford Road.
McCarthy told the club site: "I have spoken to Woody and he’s available now to go out on loan or to join a club permanently. He needs to be out there playing games.”
Wordsworth joined Town from Colchester in January 2013 but has never established himself as a regular in the side, making only 10 starts and 10 sub appearances, scoring twice.
The 25-year-old was close to a loan move to Preston North End midway through last season.
McCarthy says free agent Ambrose, who was released by Birmingham at the end of last season following a loan spell with Greek side Apollon Smyrni, is simply training with the squad at present.
"It’s not a trial or anything like that,” he said. "It’s just like Jack Collison, who is also with us.
"Darren asked if he can train with us. We’re happy to let him do that but it’s no more than that.”
Ambrose, who moved to West Suffolk earlier in the summer, played for Colchester against the Blues in pre-season.
The 30-year-old came through the Town academy and made his senior debut at Arsenal close to the end of the Blues' 2001/02 Premier League campaign.
After establishing himself in the Town side after relegation he was sold less than a year later to Newcastle for £1 million as the club sought to raise cash having gone into administration.
The Harlow-born midfielder subsequently moved to Charlton before rejoining the Blues for two months on loan during the 2008/09 season but failed to win a permanent deal.
A spell with Crystal Palace followed before he joined Birmingham in July 2012.
Elsewhere, former Blues striker Michael Chopra has joined the Kerala Blasters in the new Indian Super League, a club owned by batting legend Sachin Tendulkar.
Blackburn Rovers have confirmed that they have received an offer from Premier League Hull City for another ex-Town striker, Jordan Rhodes.