Having scored 11 goals in his first 10 games after joining United from Everton in a £75 million ($98.1 million, 84.4 million euros) move, Lukaku has not found the net in his last six matches.

But the 24-year-old Belgium international says he is still a work in progress and will only improve over the course of his United career.

"I think a lot of people are judging me as the finished article. I'm 24. You can't judge me as the finished article," he told Sky Sports.

"I'd rather have a career where year after year I improve, rather than going to the top and decline.

"I know I have a lot of talent. I know I can do a lot of stuff. I can score goals with my left, with my right, with the head.

"But I want to be a creator, I want to have more assists, I want to make sure that when my team is in difficulties, they can count on me.

"I want to be a winner. It's not about me as an individual. I want to win and I think here I'm at the perfect stage and at the perfect age where I can take my career to the next level."

United visit Premier League champions Chelsea on Sunday, looking to close the five-point gap that separates them from leaders Manchester City.