5) Diego Costa
Diego Costa was a crucial component of the title winning Chelsea team two seasons ago. At the time he was one of the deadliest strikers in Europe and his aggressive on field antics were swept under the carpet.(Top 5 Players from the Premier League)
But he had a tough second season as his antics took up more news rather than his on field performances. His disciplinary record took the front seat as the media went hard at him so much so that he considered moving away from England.
But Conte has managed to bring the best out of Costa again as his displays this season has been highly encouraging. Now he needs the rest of the team to raise their individual games to bring Chelsea back in to the title picture.