Sol Bamba has been released by Middlesbrough as the club announced their retained list following the conclusion of the 2021-22 Sky Bet Championship campaign.
The 37-year-old centre-back signed for Boro on a one-year deal last summer, having been given the all-clear from non-Hodgkin lymphoma.
He made 30 appearances for the Teesside club across all competitions, memorably scoring a penalty in the shoot-out victory over Manchester United in the fourth round of the FA Cup.
'I really want the fans to understand how important they have been for me,' Bamba told the Boro website.