Mata at Chelsea2011-12: 54 appearances, 12 goals, Champions League winner, FA Cup winner 2012-13: 64 appearances, 20 goals, Europa League winner 2013-14: 17 appearances, 1 goal (Stats are for all competitions) "The time has come for a new challenge," he said. "I am excited at the chance I have to be part of the next phase in the club's history." He added: "Chelsea is a top club and I have many fri