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The Chilean is expected to complete a big-money move to Old Trafford this week, with Henrikh Mkhitaryan heading in the opposite direction.
Arsene Wenger all but confirmed the deal would be happening when he spoke to the press on Thursday, after it was revealed that Sanchez had agreed terms with the Red Devils.
Once everything is finalised Sanchez will earn a staggering £500k-a-week.
The Chilean was photographed looking rather glum as he made his way to London Colney on Thursday morning, but had a smile on his face on the way out.
He was also pictured giving the thumbs up as he left Arsenal’s training base.