Lukaku says Mourinho couldn't guarantee him regular football this season.
"Jose Mourinho called me and he was clear with me. It is better like that. I like it when a coach is honest.
"He is the best coach I have had. He wanted to make me better and did it with a firm hand. Together, we agreed that a loan was the best solution.
"We must face challenges and mine will be at Everton."
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