The Germany international will be turning out in the Premier League next season after linking up with Unai Emery's side at Emirates Stadium
Arsenal have completed the capture of Germany international goalkeeper Bernd Leno from Bayer Leverkusen.
Goal revealed earlier on Tuesday that a deal for the 26-year-old was close, and that agreement has now been pushed through.
It is understood that the Gunners have invested €22m (£19.2m/$25m) in a new No. 1, with Unai Emery moving to strengthen a squad inherited from Arsene Wenger.
Petr Cech has been Arsenal’s last line of defence for the last three seasons, but the veteran Czech is now 36 years of age.