#1 Kylian Mbappe
The way Mbappe has shot to fame in the past couple of years is one for the books. After a cracking season with Monaco, he joined Paris Saint-Germain on loan last summer (with an agreement to sign him permanently for €180 million on the cards) and also cemented his position in the national side with his valuable contributions in World Cup 2018, particularly a ripper of a performance against Argentina which sent France into the quarter-final.
Consequently Manchester United fans are already clamoring for his signing, and frankly it is much needed. The wunderkind is only 19 years of age, and will be a sterling acquisition in the long run.
Nevertheless, the task will be a bit difficult to pull off as many top-notch clubs including the likes of Real Madrid and Manchester City are in close pursuit of the French starlet.