The Red Devils are in the market for added firepower, with the Everton striker reported to be among those on their radar ahead of the summer window
Everton striker Romelu Lukaku has said he knows what he wants to do regarding his future.
The forward scored 25 Premier League goals last season as the Toffees finished seventh but he has reportedly told the club he wants to leave in order to play Champions League football.
He has been linked with a return to former club Chelsea as well as a move to Manchester United,
Speaking to Sky Sports after Belgium's 2-1 victory over the Czech Republic in a friendly the forward hinted his mind was made up.
"My agent knows what's going to happen,
"I know what I want to do, and whenever something happens, you guys will know."
Lukaku also discussed the injury to his international team-mate Eden Hazard, who is now expected to miss around three months following a fractured ankle.
"I was next to him when he slipped, it was the last action of the game and we all thought it was just a twisted ankle," Lukaku said.
"He stood up and he was really positive. Then we heard the scan results and we were really disappointed for him, because he's a key player.
"He's had a great season so it's disappointing for a big player like him to get injured but he's got a good mentality and he's a good professional so I hope he comes back really quick."
Romelu Lukaku is better than Diego Costa, according to former Manchester City striker Shaun Goater.
The 47-year-old believes the Belgian, who tops the Premier League goalscoring charts and has been linked with a big-money move away from Everton when his contract expires in 2018, has the edge because of his potential to improve.
Goater, who played for City for five seasons and scored more than 100 goals, believes Costa, who has 19 goals compared with Lukaku's 24, is a top-class striker but has probably already reached the top of his game.
"I'm going to go with Lukaku," he said on Sky Sports when questioned about the two strikers. "He's not as consistent as he should be, but I'll go with Lukaku.
"He's 23, there's a lot more to come from him in the years to come."
Lukaku left Chelsea in 2014 after failing to hold down a regular spot in the team, but is being linked with a move away from Merseyside, and the Stamford Bridge club is being touted as one possible destination. It means that the 23-year-old could eventually replace Spanish striker Costa.
"He's a big target man, he can hold it up, he can give you that relief as a team," added Goater. "He's a decent finisher but he can improve as well.
"Diego Costa is about 28 so he's probably peaking at this time, but he's still a quality striker."
Everton's Ronald Koeman wants to keep Romelu Lukaku, saying the Premier League's top scorer has improved significantly since he became the Merseyside club's manager at the start of the season.
British media reported this week that Everton were asking a world record fee of £100million for the 23-year-old Belgian international, who has scored 24 league goals in this campaign.
"He's now a better striker for the team than he was at this time last year," Koeman told a news conference ahead of his team's trip to 13th-placed West Ham, who have landed only one victory in their last nine league games, on Saturday.
"If someone's interested they'll call the board of the club and they'll speak about it but we want to keep him. Every team wants goal scorers because they make points for the team."
Everton have lost only two league games in 2017 and are lying seventh in the league, level on points with sixth-placed Arsenal, although they have played two more games.
Koeman is targeting a top-five finish to secure guaranteed qualification to the Europa League next season and he hopes to remain in contention when Everton visit the Emirates in the last game of the season.
"That's our target [fifth place]...if we're still in the mix when we play Arsenal at the end of the season it will be really nice," the former Southampton boss said, adding that he expects to make several additions to his squad next season should they be playing European football.
“We know that we have to be prepared in the number of players we have. To have a lot of competition and that's a challenge," the Dutchman added.