Mannone will definitely depart the Emirates - with Wojciech Szczesny and Lukasz Fabianski both ahead of him, and the club chasing the services of QPR's Julio Cesar - and will fill the absence left by the departing Simon Mignolet, who joined Liverpool recently.
The former Italy Under-21 representative will compete against Kieren Westwood for the number one spot under Paolo Di Canio.