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That’s according to Red Devils legend Norman Whiteside.
The Chilean has been linked with a switch to Old Trafford from Arsenal all winter and the deal is finally set to be completed in the next few days.
Armenian winger Henrikh Mkhitaryan will move to the Emirates in a straight swap and is due to have a medical in the next 48 hours.
Sanchez has been Arsenal’s star player for the past past three years, scoring 80 goals for the club since joining from Barcelona.
Alexis Sanchez banners and shirts at the Emirates
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“United have already got a manager who has won the Champions League against all the odds before.”
Man Utd legend Norman Whiteside
And Whiteside is confident the 29-year-old will provide the magic that will bring European success back to United.
“City have got to win the title from here,” he told the Mirror.
“But after signing Alexis Sanchez I can also see United winning the Champions League.
“Sanchez is a special player who can make the difference in the biggest of games and he’s been desperate to get away from Arsenal so that he can join a club that’s going to challenge for the top trophies.
“United have already got a manager who has won the Champions League against all the odds before.
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“And Sanchez will bring that extra bit of magic to the United team when they get down to the business end of the competition.”
United finished top of Group A and will face Sevilla in the knockout stage next month.
Mourinho’s side are currently second in the Premier League, 12 points behind table-topping rivals City.
They return to action on Friday as they travel to League Two outfit Yeovil in the FA Cup.