Lee Brown has left Pompey to sign for AFC Wimbledon on a free transfer.
The 31-year-old left-back netted six goals in 131 appearances for the Blues – which includes two strikes against his new club at Plough Lane last term.
Brown arrived at Fratton Park from Bristol Rovers in the summer of 2018 and scored from the spot at Wembley to help secure the EFL Trophy later that season.
Blues boss Danny Cowley said: “It all came about pretty quickly after we signed Denver Hume from Sunderland earlier in the week.
"There was naturally a lot of interest in him from other clubs because he’s an experienced player and a great character."
“On the back of that I had a really honest conversation with Lee, who was coming out of contract with us this summer.
“There was naturally a lot of interest in him from other clubs because he’s an experienced player and a great character – both on and off the pitch.
“So there’s a lot for us to thank Lee for and it’s a really good move for him. I’ve got no doubt that he’ll do a good job of helping to develop the youngsters at Wimbledon.
“It’s a move that works for all parties and we obviously wish him nothing but success moving forward.”
Brown was named vice-captain by previous manager Kenny Jackett and continued in the role under Cowley, while he wore the armband on several occasions.