Unai Emery is reportedly looking to sign four players for Arsenal this summer.

Arsenal go into this summer transfer window knowing they have very little money to spend and even less should they fail to win the Europa League and make it back to the Champions League.
Still, the club need a ton of players and while they will look to internal solutions as much as possible, the Daily Mail report that the club want to bring in four players.
In the Wednesday edition of their paper, while covering the news about Edu we reported on Tuesday morning, the Mail also state, “Unai Emery is looking to bring in around four new players with centre back and wing priority areas.”

This is not surprising.
In addition to a centreback and wide player, Arsenal also need at least one midfielder, a left-back and possibly a keeper.