The Chilean was thought to have been on the verge of leaving the La Liga champions over the summer, but has made a successful return to the first-team under new coach Tata Martino.
Barca’s slightly more direct approach this term has played into Sanchez’s hands, and United have been impressed with his displays.
As a result, David Moyes is ready to test the Spaniards’ willingness to hold onto the tricky wide-man this winter as he steps up his transfer plans.
The Scot has grown frustrated by the performances of Nani, Ashley Young and Antonio Valencia and is ready to draft in a top player to bolster his attacking options.
Barca are thought to value the 24-year-old at about £22m, a figure that United should be able to meet.
Sanchez has been in, arguably, his best form since moving to the Nou Camp of late, but still faces an uncertain future.
Neymar, Lionel Messi, Pedro, Andres Iniesta and a number of other talented players are all vying for a role in the front three meaning game time is tough to come by.
Could Alexis Sanchez help to resurrect Manchester United’s season?
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