Express Sport understands the Chile international is set to complete a £35million move to United after they offered more money than Manchester City.
Pep Guardiola have now pulled out of the race, giving the Red Devils a free run at signing Sanchez, although Chelsea have recently emerged as surprise candidates to hijack a deal in the final hour.
It’s a massive turn of events after City all-but agreed a deal to sign Sanchez in the summer, only for the move to fall through towards the end of the transfer window.
It seemed likely he would complete a move to the Etihad this month but City are not prepared to match United’s offer.
And Sanchez’s seemingly impending move to Old Trafford has left Carragher bemused.

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“If you’re an attacking player you’d to sign for Guardiola, if you’re a defender you’d sign for Jose Mourinho,” Carragher said on Sky Sports.
United legend Gary Neville offered a different opinion on the transfer, focussing on why City wouldn’t match United’s offer.
“I find it very difficult to think that City can offer less money to a football club, less money to an agent and less money to a player and all of a sudden the player’s going to take £3m less, the agent is going to take £5m less and the Arsenal are going to take £15m less because everyone wants to go and play for Pep Guardiola,” Neville said.
United are reportedly willing to offer Henrikh Mkhitaryan in a deal with Arsenal.