Ipswich Town have confirmed that Jaime Peters, Fabian Wilnis, Michael Synnott and Sammy Moore have all agreed new contracts with the club.
Meanwhile, Ian Miller has been offered a new one-year deal with the Championship side.
Canada international Peters has been handed a three-year contract although the deal is subject to the 20-year-old being granted a new work permit.
Wilnis, Synnott and Moore have all agreed one-year contracts.
Town boss Jim Magilton confirmed on the club's official website: "Fabian is a terrific professional and has done a great job for us and deserves another year here.
"He's shown he can still play at this level and offers competition for places right across the back four.
"With Sammy and Michael, we will be keeping them on and it will be a case of seeing how they do in pre-season and then maybe looking for them to take the next step forward which is gaining first-team experience."