Speaking to Betfred, Louis Saha said: "Alexander Isak is a top player and he's really raised his game this season. His link-up play is very good, he's very sharp, he can create chances for himself cutting in from the left or right.
"And he's got a lot of flair. It's a great combination. He's a tall guy, so he could definitely be a better target man in the box, but he can certainly play with other strikers and with the wingers Newcastle United have.
"He's proven how well he can link-up with them. He's 24 years old and if he's available this summer, then I believe he could be a really good addition for Manchester United."
Isak has emerged as a key player for Newcastle after overcoming his injury issues, scoring 21 goals this season, including 17 in the Premier League.
Man United are looking to sign a striker this summer to help Rasmus Hojlund with the Red Devils choosing between a young and an experienced player.
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