The Chilean has had a busy morning, having visited the United training ground and Old Trafford where he bumped into club legend Sir Alex Ferguson before being spotted at an immigration office in Liverpool for approval on his work permit.
Henrikh Mkhitaryan was seen arriving at the same Liverpool building minutes after Sanchez, with the pair both waiting to have their documents approved by the Home Office.
The relevant paperwork should be authorised on Monday and the Premier League pair’s respective moves to United and Arsenal are expected to be announced later in the day.
Sanchez, who has chosen United over their arch rivals Manchester City, was seen arriving at Carrington at 8am before departing the club’s training base later in the morning.
Sanchez also visited Old Trafford where it is understood he was greeted by United legend Ferguson, who was pictured speaking to people sitting inside the 29-year-old’s taxi.
He was later seen leaving the Lowry Hotel, where he is staying, before leaving Manchester for Liverpool, where he travelled to have his work permit approved.
Jose Mourinho’s players have been given two days off following their narrow win over Burnley on Saturday, and are not due to return to training until Tuesday.
Sanchez said farewell to his Arsenal team-mates on Friday after training with them prior to their Premier League win over Crystal Palace.
The 29-year-old will join up with his new United colleagues on Tuesday when they begin preparations for Friday’s FA Cup fourth-round tie at Yeovil Town, following two days off after the Premier League win.