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United announced the signing of Sancho from Borussia Dortmund on Friday afternoon after a long transfer saga.
The 21-year-old cost £73 million and he'll need to produce some top performances to pay that back - which Didi Hamann believes he will.
He told the Racing Post: "It's a big season for Ole Gunnar Solskjaer and Manchester United too and I expect Jadon Sancho to be a star at Old Trafford.
"I've rarely seen a winger who can beat his man so easily, he drops the shoulder and just walks past defenders.
"Sancho could galvanise the likes of Marcus Rashford and Paul Pogba at United too.
"Having watched him in the Bundesliga, he makes other players better, creating chances and pulling defenders out of position, and we saw glimpses of that in England's quarter-final win against Ukraine at Euro 2020."
Hamann has played for Liverpool and Manchester City in the past, but didn't let that sway his opinion.
"I was surprised that he was on the periphery of that tournament, he would be my first choice as a manager," he continued.
"In my view, not only is Sancho England's best winger, he's the best winger in world football and United fans should be very excited about his return to Manchester."
Sancho joined Dortmund from United's bitter rivals Manchester City as a 17-year-old back in 2017.
Disillusioned by a lack of game time at the Etihad, Sancho instead moved abroad and became one of the world's top prospects.
He scored 50 goals and registered 64 assists in his 137 appearances for the Black and Yellow, helping them to DFB-Pokal glory last season.
A return to England has been on the cards for a while and United were interested during Jose Mourinho's stint in charge.
It's Ole Gunnar Solskjaer who has got Sancho and he's incredibly excited to work with the youngster.
He told United's official website: "We've followed him and decided to go for him and finally we made the breakthrough and got the deal done. He's got that DNA of exciting fans and entertaining and he's also a winner. He wants to win and that's the next step for us.
"We need to take the next step, we want to take the next step and we feel that he can help us do that. Of course we're going to give him a chance to develop more and more throughout time.
"It's not like in your first game you have to show everything; we've seen so many times with our players that when you play for Manchester United that gradually, with the help of the coaching staff and the platform of Old Trafford, you'll improve as a player."
Featured Image Credit: Manchester United