Reports have suggested that United have completed the signing of the Chilean and the official announcement is set to be made on Sunday.
Sanchez was scheduled to have his medical on Saturday but the club decided to postpone it after Mourinho gave his medical staff the day off.
The medical personnel had travelled with the team to Turf Moor on Saturday and the manager decided they deserved a day off.
As a result of this, Sanchez’s medical was shifted to Sunday and he is scheduled to have his medical between 5 pm to 6 pm today.
Sanchez has just shared a video on video to his Instagram story, which shows him boarded a private jet at a snowy airfield.
— Samuel Luckhurst (@samuelluckhurst) January 21, 2018
The medical is scheduled to be wrapped up on Sunday but the Chilean will only get to train with the first team on Tuesday after Mourinho gave his players two days off.