17. Wayne Rooney
Former Manchester United forward Rooney was one of the best players of his generation. The problem is that he’s still playing and not very well for Derby County in the English Championship. Meanwhile, he is also the head coach of the former Premier League team. He is not doing that very well either. Rooney is a natural striker but age robbed him of his pace. Now he drops deeper into a midfield role.
However, the former England international is not a natural midfielder and looks like a square in a round hole. Furthermore, he has no previous experience as a head coach so this is a disaster waiting to happen. In short, Rooney’s career has gone on too long and he’s no longer the same player. Combining this with becoming a manager seems like too much to do at once.