Kyle McFadzean has joined Sky Bet Championship side Burton Albion for an undisclosed fee.
McFadzean made 93 appearances and scored four goals during a two-year stay at Stadium MK, after arriving from Crawley Town in the summer of 2014.
Manager Karl Robinson told mkdons.com: “I’m deeply disappointed to lose Kyle. We had meetings with him in the summer – he knows what our ambitions are for next season and going forward but he’s decided his future lies elsewhere.
“It’s been a testing time but we’ve been strong and stuck to our principles – showing respect to our players and our fans. This deal is in the best interest of the Football Club.”