Sanchez arrived at Old Trafford in January 2018 as part of a swap deal with Arsenal which saw Henrikh Mkhitaryan head the other way.
The Chilean signed a £500,000-a-week, four-and-a-half-year deal with United making him the highest-paid player in the history of the club.
United won the race for his signature after Manchester City made it clear they would not stump up such a pay package out of fears it would create disharmony in the dressing room.
Sanchez failed to hit the ground running at United despite being given opportunities aplenty by Jose Mourinho.
He scored just three goals in the half-season after joining and continued his torrid form into the 2018/19 campaign with two goals in 27 appearances.
The forward has now earned over £41m in wages from the club and has only offered five goals in return – equating to £8.2m per goal.
The new bounce the team received when Ole Gunnar Solskjaer joined the club last December was felt by most players – but not Sanchez, who was initially injured and then failed to take his chance under the Norwegian.
Solskjaer would reportedly gladly see the back of Sanchez but the club are struggling to sell the 30-year-old.
Executive vice-chairman Ed Woodward is trying to change his image as a soft touch in the transfer market which has come about after overpaying for players and selling quality stars on the cheap.
There is also the issue of Sanchez’s wages, which are unlikely to be replicated by another other side in world football following his sharp decline.
It was reported during the summer transfer window that Woodward was willing to pay some of Sanchez’s wage if he left for another club, perhaps on loan, but the opportunity has not materialised.
For the time being, Solskjaer will have to make do with Sanchez, who showed signs of his old form for Chile at the Copa America over the summer.
“Alexis has come in and trained well,” Solskjaer said last week.
“He’s four or five weeks behind the boys and has not played apart from the one behind closed doors here, so I think he’ll see this as an opportunity as well to make his mark.
“I do expect him to stay, there’s a striker there we think is going to be able to score some goals.”