Arsenal have effectively confirmed the signing of Marcell Washington from Chelsea, with the player joining pre-season training this week.Photo via Arsenal.comArsenal’s u21 players returned to

Arsenal have signed Spaniard Kepa Arrizabalaga from Chelsea, the Premier League side said on Tuesday, with media reporting that the club triggered a five million pounds ($6.86 million) release clause to buy the world's most expensive goalkeeper.

Arsenal have signed Kepa Arrizabalaga from Chelsea in a deal sources have told ESPN is worth £5 million ($6.9m). ESPN has reported that Kepa, 30, had emerged as a top target for Mikel Arteta as a back-up to No.1 David Raya.