The 28-year-old spent last season on loan with the Gunners, making 41 appearances in all competitions, with 16 clean sheets in the Premier League seeing him win the Golden Glove.
“David showed us last season what an important player he is for us, so we are delighted he is now officially our player,” Arteta said on the Arsenal website.“We know he will take the strong foundations he put in place last season and build on them in the years to come and that he will enjoy more success with us.
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