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1 Ryan Sessegnon (Fulham / England) - £31.50m
Ryan Sessegnon is undoubtedly the most proven in professional football on this list. The English left-sided defender had a rapid rise to fame in 2016/17 season, when at the age of just 16 he became a regular for the Championship side Fulham.
He played 25 games in the English second tier, getting included in the team of the season. In the summer of 2017, there was a reported interest from Premier League's and Bundesliga's biggest clubs but Sessegnon didn't want to leave and signed a new contract with Fulham.
He said: "Last season I got a lot of opportunities so I want to continue that. When you are young you just want to play as many games as you can."
The following season Sessegnon started to play more in attack and was involved in 24 goals, helping Fulham earn a promotion to Premier League trough play-off. He was named the EFL best player of the Championship season.
The start of 2018/19 season has been difficult for Sessegnon and Fulham as a whole, as they have suffered two heavy losses [written before Fulham's game against Brunley]. The 18-year-old has made his mark as he got an assist in his second Premier League game against Tottenham Hotspur.