Arsenal have agreed a transfer fee to sell Belgium forward Leandro Trossard to Beskitas.
The 31-year-old has been given permission to travel to Istanbul to undergo a medical.
Trossard, who is contracted until 2027 with the Gunners, joined the club from Brighton for £21m plus add-ons in January 2023.
“Negotiations have commenced with professional football player Leandro Trossard and his club Arsenal regarding his permanent transfer,” the Turkish Super Lig side said in a statement.
He has scored 36 goals and registered 34 assists in 174 appearances at Arsenal, helping Mikel Arteta’s side win last season’s Premier League title.
Trossard was a key player last season for Arteta, starting in the Champions League final defeat by Paris St-Germain and 21 times in the league.
Belgium reached the quarter-finals of this summer’s World Cup, with Trossard starting all six games and scoring twice.