Reserve coach Chris Kiwomya and fitness coach Simon Thadani are set to join goalkeeper-coach James Hollman on their way out of Town over the summer.
Hollman wasn’t with the squad at Leicester on Saturday and is moving on, having joined the club under Jim Magilton’s management in 2008.
Former striker Kiwomya was also brought in by Magilton in 2008, while Thadani has been at Portman Road since George Burley’s time as manager.
Spanish fitness coach Antonio Gomez, the last remaining member of Roy Keane's backroom staff, is understood to be staying at the club.
Manager Paul Jewell hinted last Thursday that there would be major changes to his backroom during the close season: "Like everything else you’re always re-evaluating your staff. When I came in I said I’d have a look at it. Staff, like players, are important and sometimes a manager comes in and changes things, most managers change things.
"Most staff only get jobs because someone else is being moved on. It’s never anything personal. I’m looking at the whole structure of the staff, both senior and junior and trying to improve everything, which is what I want to do. I want to have an input on almost everything that goes on on the football side of it.”
Academy physio Mark Endacott is also understood to be moving on of his own volition.