#10. Zlatan Ibrahimovic
This is by far the most transfer on the list but really deserves credit. He may be 34 years old but the signing of Zlatan Ibrahimovic has excited everyone at Manchester United and can be considered quite a coup for the club. The Swedish forward arrived in Manchester in the summer of 2016 on a free transfer from PSG. Ibrahimovic spent four seasons at the Parisian club, winning four Ligue 1 titles. He scored an incredible 156 goals during his four seasons for the club including 50 in 51 matches last season, by far his best goalscoring season as a professional footballer.