“It was the biggest mistake they’ve ever made.”
Sherwood also believes that the Red Devils could challenge for the Premier League title next season if they secure the signing of either Erling Haaland or Harry Kane in the summer.
Lukaku joined Man United from Everton in a reported £75m deal plus add-ons, back in 2017.
The Belgian had established himself as one of the Premier League’s best strikers at the time, scoring 87 goals and providing 29 assists during his four years with the Toffees.
However, Lukaku failed to hit the heights that were expected of him at Old Trafford. Nevertheless, he still contributed a respectable 42 goals and 13 assists in 96 games for the Red Devils.
The Belgium international eventually left for Inter Milan in the summer of 2019. Lukaku has proven himself to be an indispensable asset for the Italian side this season, scoring 21 goals in 32 league matches.
Inter currently sit atop the Serie A table with 79 points and look set to win their first league title since 2010.
Sherwood on selling Lukaku.
Sherwood, speaking to Premier League productions, believes that Man United need to sign a centre-forward in the summer.
“What (Man United) do need is a centre forward. They’re going to need someone,” Sherwood said.
“They had someone and it was the biggest mistake they’ve ever made getting rid of Romelu Lukaku, who’s on fire now at Inter Milan.
“Edinson Cavani might not be the answer to challenge Man City because of his game-time.
“But I think he’s brilliant for the younger boys. For (Marcus) Rashford, (Mason) Greenwood and (Anthony) Martial to watch him every day in training is great because what he does is an art.
“Who do Manchester United go for this summer? Is it Haaland or is it Kane? If they get one of those two in they would certainly be up there challenging for the Premier League title next year.”
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