Madrid: Atletico Madrid midfielder Koke said Friday that he is very happy at the return of striker Diego Costa to the club after the Spanish international’s three years at Chelsea. Chelsea and Atletico announced Thursday that they had reached an agreement for the Brazilian-born Spaniard to rejoin his former team in a transfer deal, worth $74 million. “I am always glad when an important player joins the group to help us to improve,” Koke said. “I had a special link with Diego. Every time I had the ball, I knew his next move, and virtually every pass was a goal,” he added.