The burly frontman headed to Russia this summer on the back of a debut campaign at Old Trafford which delivered 27 goals.
With his confidence high, the 25-year-old has proved to be an inspirational presence for the other Red Devils that he represents.
Former United defender Ferdinand is among those to have been impressed by a striker who can look unplayable on his day, telling BBC Sport: “It's like playing in the school playground and you have a 16-year-old playing against the 11-year-olds.
“It's like that he's too big and too strong for everyone.
“He almost shouldn't be allowed to play with them!'”
Lukaku is pleased with his contribution to Belgium’s World Cup cause so far, with a prolific marksman eager to point out that he wants to offer more than just end product.
He told reporters after booking a semi-final berth with France: “Everyone thinks Romelu Lukaku is just about goals, goals, goals, but I want to be seen as an all-rounder.
“Providing assists is also important, and this year I have provided more than ever. Of course I want to score but, at the same time, I try to work as hard as I can for the team.
“I don't have to prove myself any more [as a goal scorer]. Everyone knows I can score with every chance provided to me in the box, but the individual doesn't count here.”
Belgium will face France in St Petersburg on Tuesday, with the Red Devils’ so-called ‘Golden Generation’ looking to deliver on the promise that they have shown for a number of years.