Romelu Lukaku says he will 'never forgive' Andre Villas-Boas after claiming his treatment at the hands of the former Chelsea manager was 'weird'.
The teenage striker joined Chelsea from Anderlecht last summer, but failed to start a Premier League game or appear in the UEFA Champions League during Villas-Boas' brief reign.
Villas-Boas was sacked by the Blues in early March and Lukaku has criticised the way the Portuguese treated him, particularly in training.
The Belgium international told Sport Wereld: "There is one person that I will never forgive for what he did to me - the previous coach.
"It's not just that. It was also the way he spoke to me and treated me.
"Right from the beginning, it was weird. I could not stand how he was treating me. I received no explanation.
"In training, he put me on the right or left wing. In training matches, I was a substitute with a shirt to keep swapping teams. I really learned nothing!
"I have told the club that too. I understand that he was under pressure, but I was also thinking of myself. I have improved in recent months."
Roberto Di Matteo replaced Villas-Boas and Lukaku's only appearances under the interim manager came in the final two league games of the season.
However, after also not being involved in the squad for Saturday's Champions League final triumph over Bayern Munich, he was delighted with the outcome.
Lukaku added: "I could not believe it. I had to think, 'Is this really happening'? European champion... My life has changed and I'm only 19."