#5 Davide Calabria (AC Milan)

Davide Calabria is a 22-year-old right back who currently plays for AC Milan in Serie A. He has represented Italy at U21 level a total of 18 times, but is yet to make his debut for the senior team.
Although Diego Dalot has started to replace Antonio Valencia in the right-back role at United, Calabria is arguably better suited to that position. And with Dalot having been pushed up to a right midfielder role, space is open for Calabria to slot into, should United get his signature this summer.
Calabria has featured in 22 matches for Milan so far this season, netting a goal and an assist in the process. His pinpoint passing and ability to pick out a cross is what separates him from the rest challenging for his position. I don't doubt that in a few years, Calabria will be well on his way to becoming one of the best in the role.
With him being so young right now, Calabria's price tag is only estimated to be around £20m, but for a team to sign him, Milan will likely want to double it, as they know his worth right now, and what he could become later on down the line.