Reina has signed for Napoli on a season-long loan.
“It was a really big boost for us to get Pepe Reina because he is a world-class goalkeeper,” he said ahead of this weekend’s Emirates Cup. “It was surprise for us when he became available so we were pleased to get him.
“The game against Arsenal will be a difficult one but we want to win by playing good football and finding the right balance between attack and defence. The main thing for us is to improve in pre-season game by game."