5. Florian Thauvin (Newcastle United)
In January 2014, he was named by British newspaper The Observer as one of the 10 most promising young players in Europe - such was the reputation and high regard with which Thauvin was held in the football world when Newcastle United signed him from Marseille in 2015.
Unfortunately for him though, his one-season stay at St.James Park could be best described as a disaster; the young striker found it extremely difficult to settle in the Premier League.
With just one goal in 16 appearances, Thauvin was loaned back to Marseille in 2016. And after impressing with 15 goals in the 2016/17 season, the move was made permanent.
Thauvin exploded last season with 26 goals in 52 matches as Marseille reached the 2018 Europa League final. He was also part of the France team that emerged world champions at the 2016 World Cup in Russia.