Town’s fitness coach Jim Henry is understood to have left the club.
Henry, 68, whose official job title was head of athletic performance/sports science, joined the Blues just over two years ago when manager Paul Lambert took charge at Portman Road having previously worked with the Blues boss at Stoke.
The sudden departure is believed to have come as a result of friction with the club's football management over recent weeks.
Following his exit first-team coach Matt Gill has taken on Henry's warming up duties at the last two matches.
A former Scotland international judo athlete, Henry has also worked at Bury, Rangers, Hibs, Sunderland, Aston Villa and Celtic.