Costa is still AWOL in Brazil and is refusing to return to training despite a move to Atletico Madrid falling through last week.
Hazard said: “Diego? We spend three years together and we won everything, not the Champions League but we won the League. It was a pleasure to play with him.
“I want him back but you know I don’t make the decision. But he is a top guy, a top player.
“I hope for him in the future he can find a solution and I want to see him on the pitch soon.”