Crystal Palace have joined the race for Galatasaray full-back, sources have told Turkish-Football.
Palace have been interested in Boey all season and are keen on an end of season move for the French defender.
The Premier League side want to strengthen their right-back position next season and have identified Boey as a target.
The Eagles have been scouting the 22-year-old along with Newcastle United.
Boey has been one of the stand out players in a Galatasaray side that is currently first in the Super Lig having won their last 13 games in the league.
The Yellow-Reds are six points clear at the table ahead of rivals, second placed Fenerbahce.
The Lions are aware of the growing interest and are not willing to accept offers below €20m.
Boey joined the Lions for just €1.15m from Rennes in July 2021. Galatasaray stand to make a significant profit if they sell for the fee being demanded.
The full-back is under contract until 2025 but Galatasaray have been in talks with his agent company ROGON over extending to 2026 on improved wages with a possible release clause reflecting their valuation.
The 22-year-old has excelled since joining and has two assists in 20 leagues appearances this term. The full-back has represented France at U17, U18 and U20 level.