The Red Devils have been heavily linked with a swoop for the £20 million-rated Chilean international in recent weeks, but The Daily Express now report that the club have been informed that the Catalan giants won't discuss a fee for the player until after the completion of this summer's World Cup in Brazil.
It is further speculated that the reason behind such a move appears to be based on Barcelona's understandable belief that an impressive showing from the 25-year-old on his home continent could see his transfer value soar, thereby earning them more money in the event that they do indeed seek to move Sanchez on elsewhere.
A real livewire who possesses pace and trickery in abundance, Sanchez first established an exciting reputation over in Serie A with a successful five-year stint at Udinese.
His encouraging displays at the Stadio Friuli earned him a big money-move to Barcelona in 2011, a club with which he has won both the La Liga title and the Copa del Rey tournament in Spain.
While not always an automatic first choice at the Nou Camp, Sanchez has nevertheless successfully demonstrated his versatility by thriving either in a wide role or as the supporting striker.
If Manchester United could entice Sanchez into moving to Old Trafford, he would no doubt represent a significant early signing for new manager Louis van Gaal.
The experienced Dutch boss - who will take the reigns on a full-time basis following the Netherlands' own World Cup campaign - is expected to make a number of big additions to revitalise Manchester United's squad prior to the start of next season and Sanchez would certainly add a real boost to their existing attacking unit.
It remains to be seen just how high a price Manchester United would be willing to pay to get their man, but they already appear to be facing rather stiff competition from the likes of Italian champions Juventus who are believed to be eager to take Sanchez back to Serie A.