“I am very happy to sign for Chelsea. Everybody knows it is a big club in a very competitive league, and I am very excited to get started in England with a fantastic coach and team-mates,” he said. “I would like to thank everybody at Atletico who made me into the player I am, it was an incredible time for me, but now I am starting a new adventure and I hope to win many trophies with Chelsea.” Diego Costa has signed for Chelsea on a five-year deal after the club paid Atletico Madrid €40million. Rik Sharma CEST Upd. at 20:36 “Having played against Chelsea last season I know the high quality of the squad I am joining. 15/07/2014 Costa will join up with the first team for pre-season training next week.