​Former ​Manchester United and current ​Inter Milan striker, Romelu Lukaku has hit back at the criticism over his weight, taking to social networking site, Instagram to reveal his thoughts amid fears that he could miss the start of the season due to fitness issues.

Lukaku completed his much awaited move when he ​left ​United for Inter for a fe​e in the region of €80million, with Red Devils legend, Gary Neville revealing that the club made the right decision to sell the Belgian, branding the striker, "unprofessional" and "overweight".

"He admitted he was overweight! He is over 100kg! He’s a Manchester United player! He will score goals and do well at Inter Milan but unprofessionalism is contagious," Neville had tweeted following his departure.

Neville was not the only former United player to take a dig at the striker, with Gary Pallister also claiming that, "He's too heavy. You look at the pace in the present game; maybe Ole is looking at that and saying he can’t implement that into his game for me. He was surplus to requirements."

Corriere dello Sport had recently reported that that Lukaku might not start in their season opener, as he was overweight, with it being claimed that the medical staff will not play him when he weighs 104 kg and instead wants him to reduce weight to 100kg.

Lukaku, for his part took to Instagram to reply back, simply posting a snap and stating, "Not bad for a fat boy."

Inter open their Serie A campaign against newly promoted, Lecce on Monday, the 26th of August.