United have improved their record against other members of the top six hugely this season, but they have quite often followed up some of their best performances of the season with mediocre displays in the following fixture.
"I don't know, you'd have to ask the manager.I'm really confident in my team-mates."
"It was a unusual season for us", added the 24-year-old.
The Red Devils reached the final of the FA Cup on Saturday by coming from behind to beat Tottenham 2-1 at Wembley, with Lukaku picking up the assist for Ander Herrera's victor.
The Red Devils are in second place in the table, and are expected to finish there, but they have been some distance behind champions Manchester City for most of the season.
"But we know what we have to improve for next season". "I think we can do it with the team we have now, but we should have shown more consistency throughout the season", he told reporters after the FA Cup win over Tottenham, as quoted by AS.
Although Premier League success has long looked unattainable this season, United are at least closing in on ending the campaign with a trophy after victory at Wembley.
"Winning the FA Cup would be nice, but I don't want to talk about it, I just want to end the season well, hopefully take second and that will prepare us really well for the final".
"Well, I want to win the title, that is the thing", Lukaku added.
But the Belgian striker says that while a cup win would be great, he has bigger prizes in his sights for the future. "We just have to be more consistent".