Gary Neville has blasted Romelu Lukaku for his lack of professionalism surrounding his weight, calling it 'unforgivable' to be overweight.

Lukaku tumbled out of the Manchester United exit door with Inter Milan completing a £72million deal, including £12m in bonuses, for the forward on deadline day for English clubs.

The Belgium striker had trained away from Old Trafford this week after going AWOL by practising with his former club Anderlecht and their Under 18s on Monday and Tuesday.

Romelu Lukaku completed a move to Inter Milan but has been criticised about his weight

He flew to Italy on Wednesday with his agent Federico Pastorello ahead of undergoing a medical on Thursday before signing a five-year deal with Inter until June 30, 2024.

The 26-year-old had not played in any part of United's pre-season due to a mysterious ankle injury but arrived for the start of it overweight according to Neville, much to his disdain, who tweeted that he was over 100kg.

'I think he is a really good player – he'll score a lot of goals and do well at Inter Milan,' the United legend told Sportsmail at the celebration of TalkTalk's five-year shirt sponsorship deal with League Two outfit Salford City – a club in which he owns a 10 per cent share.

Former Man United full back Gary Neville launched a scathing attack over Lukaku's conduct

'But the idea of a player being overweight for me is unforgivable. You can play badly, miss shots on goal, hit a bad cross or give goals away as they're mistakes in football but you can't be overweight.

'You can't go out on a Friday night and drink alcohol – there are things that you're in control of. These two lads [Paul Scholes and Ryan Giggs, fellow United greats who also own 10 per cent of Salford] played until they were 38 and 40 and played for 25 years at the top winning numerous titles.

'There's no excuse for not being fit. We were never overweight, not fit or not prepared. How can you be overweight!?'

Lukaku's departure leaves a void in the goalscoring department for Ole Gunnar Solskjaer's side.

With the transfer deadline shut, the Red Devils will have to rely heavily on just Anthony Martial and Marcus Rashford for goals while 17-year-old Mason Greenwood will embark on his first full season as a first-team member.

Neville had spoken to Sportsmail at a celebration of TalkTalk's five-year deal with Salford City

And while Lukaku's output will be hard to replace, having scored 27 times in his first campaign at United followed by 15 last term, Neville believes Solskjaer has done the right thing as he looks to overhaul the culture at the club.

'There's no excuse [on Lukaku's weight]. My view on Romelu Lukaku is that if Manchester United are trying to set a new tone and culture through the club, which Ole is trying to do, any lack of professionalism has got to be stamped upon,' he added.

'He didn't want to be here anyway. Romelu Lukaku has admitted himself that he was overweight so he has removed all doubt.'