#2 Sebastien Haller
Sebastien Haller is the 2nd Bundesliga player on this list and is perhaps going to be the cheapest option of the lot. He is thought to have a release clause of about €20 million, and that is a very small amount for a player of his talent. He was highly impressive for Eintracht Frankfurt and formed a deadly trio with Luka Jovic and Ante Rebic.
He has been linked with a move to United and there aren't many other clubs in the race to sign him. He scored 20 goals and assisted 12 in 41 appearances for the German club. While it was Jovic who hogged the limelight, Haller had a season that was as good as his counterpart's. Both of them averaged 97 minutes per goal involvement, showing that Haller is also a quality player.
If Solskjaer decides to buy the Frenchman, it will not take a lot of effort for the club to sign him due to his puny release clause.