Sunderland AFC can confirm that midfielder Jeremain Lens will join Besiktas JK permanently on 1 June for an undisclosed fee.



The 30-year-old has spent the season on loan with the Turkish Super Lig side, who have now exercised an option to sign the attacker permanently.



Lens joined Sunderland from Dynamo Kiev in 2015 and made 24 appearances, scoring three times.



He spent last season on loan at Fenerbache before returning to Turkey with Besiktas last summer.