Wilnis joined Ipswich in 1999 and has made 325 apperances for the club. His current contract has just ended and he has not been offered another deal. He is weighing up his options and has not ruled out playing for another season. He is also taking his coaching badges this summer.
Town manager Jim Magilton: "Fabian has been a fantastic servant to this Football Club and has to be one of the best signings Ipswich have made, not only has he been a team-mate and player of mine, he's been a friend as well and has been a tremendous ambassador for the Club. He fully deserves his testimonial and I'm sure it will be a success."
Town Chief Executive, Derek Bowden: "A committee representing Fabian have made an official approach to the Club over hosting a game as part of a testimonial year and given his time and service to Ipswich Town, we are happy to oblige."
No date has been set for the testimonial match.