Brentford midfielder Jonathan Douglas is reported to have agreed a one-year contract with the Blues plus an option for a further season. The 33-year-old is out of favour at Griffin Park and is set to join Town on a free transfer.
According to Sky Sports personal terms have been agreed with the Irishman having been due at Portman Road for a medical and talks earlier this afternoon.
Monaghan-born Douglas, whose partner is Sky Sports News presenter Natalie Sawyer, moved to England in 2000 when he joined Blackburn Rovers. While at Ewood Park he spent time on loan at Chesterfield, Blackpool and Gillingham before moving on to Leeds in 2005.
After four years at Elland Road, the 6ft tall holding midfielder moved to Swindon before he joined Brentford in 2011.
Douglas, who has been capped eight times by the Republic of Ireland, signed a new contract with the Bees in February but is not in new manager Marinus Dijkhuizen's plans and last month he was told he could move on.
"He is not part of the squad and is training separately. There is no future for him," Dijkhuizen told BBC London.
"We decided it is better for him to move on - for his future and for the future of Brentford."
Last season Douglas made 46 starts and scored eight goals as the Bees finished fifth in the Championship, one place above Town.
Last week, the Blues missed out on signing another Brentford player, Northern Irish winger Stuart Dallas, who is set to join Leeds United in a £1.25 million deal.