4. Henrikh Mkhitaryan
Mkhitaryan is one-half of one of the worst transfer deals in Premier League history. He moved to Arsenal from Manchester United, with Alexis Sanchez going the other way. In short, both teams thought that they were getting the better deal. Neither of them has worked out at all.

Mkhitaryan was superb in the Bundesliga for Borussia Dortmund. Above all, the Armenian showed a great eye for goal and was brilliant at linking play. However, he’s just a bit too light for the Premier League and was unable to assert himself in games for Arsenal. Just what they needed: another lightweight attacking midfielder.