The Germany international was reported to have cost the Gunners a transfer fee in the region of £20m.
Leno will compete with Arsenal number one Petr Cech and Colombian shot stopper David Ospina for a starting spot.
The Czech Republic international was handed the Arsenal number one shirt to suggest the veteran goalkeeper is part of the north London side’s plans.
The German shot stopper has put pen to paper on a five-year deal with the Gunners to ensure the goalkeeper will remain at The Emirates until 2023.
Leno is a Germany international but was omitted from their World Cup squad for the 2018 tournament in Russia.
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