#4 Julian Weigl (Borussia Dortmund)
Julian Weigl signed a five-year deal with Borussia Dortmund in 2016 and is yet to extend his deal. Similar to Grimaldo, the German's contract runs down within two years and could be available for a cut-price deal in the forthcoming transfer windows.
The contract talks have not begun yet since he's eyeing a move away from the Signal Iduna Park after being an understudy in the midfield and defence. Still only 24, Weigl could do himself favour should he decide to leave Borussia Dortmund to play in his preferred position frequently.
Weigl is an intelligent passer and can play in the freeflowing manner demanded by Solskjaer. He has started five Bundesliga games under Lucien Favre this season, wherein he has done immaculately well to fill in for Thomas Delaney and Mats Hummels on occassion.
Manchester United currently have Scott McTominay, Nemanja Matic and Fred as defensive midfielders. However, Julian Weigl is head and shoulders above the above-mentioned trio.