#4 Yevhen Konoplianka
Yevhen Konoplianka was once tipped to become the next big thing out of Ukraine after his move to Sevilla in the summer of 2015 from Dnipro. He had been watched by scouts from top clubs across Europe, but they were apprehensive about signing him for he was prone to bouts of inconsistency.
He showed this negative trait at Sevilla and struggled to get into the first team, resulting in him being loaned out to Schalke the following summer. His spell in the Bundesliga was a lot better than his time in La Liga, as he seemed to fit the style of play, along with the speed of the division.
Schalke would buy him for £11.5m once his loan spell ended, and whilst he had a promising start at his new club, he soon became anonymous out on the pitch, resulting in him slipping down the ranks. He now tends to warm the bench and occasionally get brought on later into games, but that's the extent of it.