Arsenal have confirmed that Ryo Miyaichi has joined St Pauli.
The 22-year-old had numerous loan spells away from the Gunners with the likes of Feyenoord, Bolton Wanderers and Wigan Athletic following his arrival in 2011.
In total, the winger made seven senior appearances for the Gunners, although he failed to get his name on the scoresheet.
Last season, St Pauli finished 15th in the second tier of German football.