Arsenal have sold Ivory Coast utility player Emmanuel Eboue to Galatasaray for a fee of about £3m.
The Turkish club announced the deal on Tuesday, adding that the 28-year-old has signed a four-year contract.
Eboue made 214 appearances for the Londoners but was not handed a squad number ahead of the new season.
"Everyone at Arsenal thanks Manu for his contribution and wishes him the best of luck," read a statement on Arsenal's official website.
Galatasaray are not in Europe this year after finishing eighth last season, 36 points behind champions Fenerbahce.
Eboue, who joined Arsenal from Belgian club Beveren in 2005, must wait for his debut with the start of the Turkish season put back to 9 September because of an investigation into match-fixing allegations.
Arsenal sold Cesc Fabregas to Barcelona in a deal worth a potential £35m to the Gunners on Monday, while .
Meanwhile, Arsenal have announced that Carlos Vela will spend this season on loan in Spain at Real Sociedad - subject to a medical.
The Mexican forward played 13 times for the Gunners last season, but also spent time with West Brom on loan from January.