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Clearly just as United need active sellers to buy from, they need buyers so they can offload those players they do not want.
In Marcus Rashford's case, there are a limited number of clubs globally who could match his current salary. And where a club are interested, the player has to want to join them.
Judging by his recent social media post, he would not do anything to jeopardise his England place.
BBC Sport has also been told of some Premier League clubs he would not be keen to move to.
So where will Rashford be when the transfer window closes on 1 September? Currently, the likeliest answer, by some distance, is Manchester United.
After that: Any Spanish club, any Turkish club, any German club. The vagueness there underlines the current lack of market for the 15th highest scorer in United's history, with 138 goals - someone who is only 17 short of a place in the top 10.
There are plenty, including former captain Gary Neville, who feel Rashford's time at Old Trafford is over and there should be no reconciliation.
In the end though, it may have to happen - and not everyone would be disappointed.
"A fit and focused Marcus Rashford has the ability to be one of the best players," said Rashford's friend Sam Smith - the Wrexham forward who scored the winner in their pre-season victory over Carrick's team in Helsinki on Saturday - when speaking to the United We Stand podcast.
"He has everything.
"He has had a difficult time at United and getting away from it all was a good thing.
"I don't know what is going to happen but as his friend, I hope he comes back and proves how good a player he was, how good he can be and starts scoring goals again."
