Defender Michael Nelson will join Chesterfield upon expiration of his contract this summer.
Speaking on Twitter, Nelson, who made over 100 appearances for the Bees, many of which as captain, has said: "A massive thank you to everyone at the club, teammates, staff & fans.
"You have all made my 3 years at the club memorable & enjoyable. I have made some great friends both on & off the pitch who I know will remain friends for a very long time.
"After playing 107 games, coaching the U23's & also having a stint as assistant manager for the club the time has come to move on.
"It was a massive honour to captain your club & it will always have a place in my heart."
We would like to thank Michael for his time and efforts across his three seasons at the club.