United are competing with Aston Villa for the teenage defender.
And it's emerged both clubs have also been scouting 19 year-old defender James Hill.
Fleetwood chief Steve Curwood admits the club has no interest in holding back their best young players.
He told the Fleetwood Gazette: “Sometimes it's not just a case of trying to keep them; sometimes it's a case of working out whether the value of the player is sufficient for someone wanting to take him now, rather than us keeping him, developing him and increasing his value.
“It's a delicate balance between capitalising on your asset at any given moment in time.
“Would we like to sell James Hill, as one example? It's a very abstract question really. It depends what the value is being offered to us at this moment in time.
“It would be naive to say we'd love James to play at Fleetwood for another two years and then go for £10m, but if someone offered something serious now we'd have to consider it.
“And we should do. You shouldn't want to hold players back."
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