Arsenal have signed 17-year-old defender Marcell Washington following the expiry of his contract at Chelsea. The highly rated left-back was previously on trial with the Gunners for more than two months and made seven appearances in Premier League 2 during that period.

Arsenal have completed the £5m signing of goalkeeper Kepa Arrizabalaga from Chelsea. Spain international Kepa joins the Gunners on a three-year deal after spending last term on loan at Bournemouth, where he made 35 appearances in all competitions.

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.