Sporting Lisbon will refuse to sell William Carvalho before the World Cup unless his £37m release clause is met, according to A Bola.
David Moyes has sent scouts to Lisbon a number of times to keep tabs on the 21-year-old and is keen to make him part of a revamped Manchester United next season.
However, the bid is doomed to failure as the Portuguese outfit are unwilling to part with any of their international stars before the World Cup unless, of course, their release clauses are met.
The theory is that a good World Cup will increase the value of their players and give them a better negotiating position as more and more clubs become interested.
It is bad news for Manchester United, who are understandably keen to get business done before the tournament starts in June.
Carvalho currently has a release clause of around £37m (€45m) and he won't be leaving for less than that before the World Cup.
The implications of not buying him before the World Cup could be massive for the Red Devils, who would be running the risk of missing out on one of their top targets. If Carvalho has a good World Cup with Portugal, a number of clubs would be alerted to the player's ability and subsequently drive up the price.
The Old Trafford club already face competition from Premier League rivals Liverpool for his signature and could struggle to attract Carvalho if they miss out on Champions League football.
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