Chelsea manager Jose Mourinho has admitted he will be looking to bring in two big-name players this summer - but refused to confirm his interest in Diego Costa.Mourinho is confident Chelsea will be in a better shape to win trophies next term after a 'transitional' season at Stamford Bridge. And he has also questioned Eden Hazard's team ethic in the wake of Chelsea's midweek Champions League exit. "Eden is the kind of player that is not so mentally ready to look back to his left-back and to leave his life for him. "If you see the first goal of Atletico you completely understand where the mistake was and why we conceded that goal. "The perfect team at the top level cannot make these kinds of mistakes." While Mourinho has praised Hazard's willingness to work at times this season, he says there is still a lot of work for him to do. "I'm not happy," Mourinho said. "I speak all season and I try to improve him all season."