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Rangnick exited Old Trafford in the first week of Erik ten Hag's reign as manager.
He was supposed to take on a consultancy role, but departed shortly after the Dutchman was appointed.
However, the veteran German manager made FOUR recommendations to the board before he left, according Samuel Luckhurst.
He regarded 20-year-old Croatian defender Josko Gvardiol as a 'must-buy' following his performances in the Bundesliga.
Not to mention Austrian midfielder Konrad Laimer, who has been generating interest from Bayern Munich.
Rangnick also advised Man United to scout RB Leipzig star Christopher Nkunku before he signed a new contract.
Finally, the 64-year-old 'flagged' Julian Alvarez as a possible attacking option in January before cross-town rivals Manchester City struck a deal with River Plate for £14 million.
Of course, Rangnick's recommendations failed to materialise, with Man United unable to capture any of the names that he suggested for the club.
It's not the first time Rangnick has called for Man United to act.
Following his old team's 4-0 defeat to Liverpool last season, he said the club needed a 'rebuild'.
Ralf Rangnick knew these players aren’t good enough. They sacked him instead of listening pic.twitter.com/5TY1HWfSW2— 𓃵 (@UtdGen) August 7, 2022
He exclaimed: "The team needs a rebuild. Not because some players have to go but quite a few have no contracts anymore, their contracts are expiring, then for me it’s clear there will be six, seven, eight, maybe ten new players.
"Before you sign those players, you need to be aware of how you want to play, what kind of football does the new manager want to play?"
Rangnick added: "If you look at the two clubs that are currently dominating the Premier League [Manchester City and Liverpool], they did exactly that.
"They changed the whole thing with regards to formation, what kind of players do we need, what kind of football do we want to play?
"The headline of everything was: 'How do we want to play?'
"And underneath this headline, in every transfer window they’ve created the team that they have in both clubs."