Town have announced that striker Luke Varney has re-signed on a short-term contract until January.
Varney, 33, was released by the Blues at the end of last season, having signed a previous short-term deal after recovering from the achilles injury he suffered in the play-off semi-final against Norwich City at the end of 2014/15 when on loan from Blackburn.
The Leicester-born frontman, who has been given the number 12 shirt, will go straight into the squad for Saturday's game at Brentford.
The Blues are currently short of striker cover with Brett Pitman sidelined with a thigh injury.
In his previous two spells at Portman Road Varney has made 11 starts and 21 sub appearances, scoring two goals, the most recent in the 3-2 victory over the MK Dons in the final home game of last season in April.
Boss Mick McCarthy is continuing to look for additions with Premier League loan players remaining on his radar as well as permanent signings.