Colchester United defender and captain Magnus Okuonghae is set to leave the U's after the club decided not to offer him a new deal.
The 29-year-old made 218 appearances for League One side Colchester since signing on a free transfer in 2009.
However, he featured only 11 times this season after rupturing his Achilles tendon against Coventry in November.
"Magnus has been an excellent servant to the club," U's manager Tony Humes told the club's website.
"It was a difficult decision to let him go, especially with the serious injury he sustained.
"But with the direction in which the club are going, it was felt that it would be in both parties' interests for Magnus to seek his football future elsewhere."
Colchester finished 19th in League One this season, two points clear of the relegation zone.