“He admitted he was overweight!” tweeted Neville. “He is over 100kg! He’s a Manchester United player!
“He will score goals and do well at Inter Milan but unprofessionalism is contagious!”
Lukaku laughed off the tweet to BBC Sport and responded: “Don't question my professionalism.
”I live for this game. I am at home all the time. I try to do everything to improve."
"He (Neville) can talk about my fitness but he should never say anything about my professionalism, that I don't work hard enough.
Romelu Lukaku carried more weight than usual last season at Man Utd (Image: Getty)
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Romelu Lukaku scored on his Inter Milan debut after leaving Man Utd (Image: Getty)
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“That is something he cannot say. All the coaches I have had say the same thing about me.
"What did Ole Gunnar Solskjaer say when I was on the training ground? What did he say? That I always work hard and always do my best to try and improve myself.
“Same with Jose Mourinho and Roberto Martinez. Now Antonio Conte will say it.
"Last year was just a bad year. It happens in football. You just have to move on. I am not going to sit here and react in a negative way.
"We are grown men. He is a pundit. He gets paid to say this kind of stuff. I am paid to play football.”