#5 Leroy Sane (€50 million)
Nobody is talking about Manchester City's superstar signing because he's a bit of an unknown entity. Sane is young, exciting tricky winger who's got Pep Guardiola's attention. The 20-year-old made his senior debut for Schalke two seasons ago and has grown from strength to strength in every of the 47 appearances he made for the club.
Known for his bursts into the box, Sane is a real threat for Manchester City this season. Raheem Sterling and Nolito might get more starts under Pep this season but Sane will soon be the one who could dominate with the Citizens.
He's got an eye for goal, the ability to dribble past most defenders and the outright pace that's much needed in the Premier League. All he's missing is the experience in England and that'll come in time.