Leandro Trossard has joined Turkish Super Lig side Besiktas in a permanent deal from Arsenal.
Trossard departs the Premier League champions in a deal worth £17m, broken up into an initial £15.3m plus £1.7m in add-ons.
An Arsenal statement said: "Leo joined us from Brighton & Hove Albion in January 2023 and made 174 appearances in all competitions for us, scoring 36 goals and assisting 34 times.
"Everyone at Arsenal would like to thank Leo for his valued contribution to the club and wish him all the best for his future."
Trossard became a crucial player in Mikel Arteta's Arsenal - playing 174 times in three and a half years, scoring 36 goals.
During Arsenal's title-winning campaign last term, Trossard scored eight goals and registered 11 assists in 50 matches in all competitions, as the Gunners also finished as Champions League runners-up.
Your Site' Sam Blitz:
Scoring one of the biggest goals in Arsenal's Premier League history, Leandro Trossard will go down as one of Arsenal's biggest cult heroes.
That goal against West Ham on May 10 all but got Arsenal over the line. From then, the Gunners lifting the title was a formality. Not bad for someone who cost just £27m back in January 2023.
That moment summed up Trossard's time at Arsenal - the Belgian came up 'clutch' on so many occasions for Arsenal.
Seventeen out of his 27 Premier League goals for the club either put Arsenal level or in front in matches - only Bukayo Saka scored more goals of that kind since Trossard joined the club.
In selling the Belgian, Arsenal will be losing a lot of 'clutch moments' but this is a good time to recoup a lot of the £27m spent on him - with Trossard now 31 and having one year left on his contract.
It is also part of a potential overhaul at left wing, as Gabriel Martinelli's contract also expires in the summer of 2027. Arsenal could be entering next season with completely different options on that flank.
Their priority target is Aston Villa's Morgan Rogers but PSG's Bradley Barcola has also been touted as a potential first-choice option.
Club Brugge winger Christos Tzolis is also a player Arsenal have been looking into bring on the left. It is understood Tzolis would cost in the region of £34m - a Belgian Pro League record.
Now the World Cup is coming to its end, Arsenal are starting to show their hand in the window. Trossard is the first serious piece of business, so which domino will fall next?
