#1 Antoine Griezmann
With Mourinho at the helm and the likes of Romelu Lukaku and Paul Pogba brought to the club, United looked towards Atletico Madrid's French superstar Antoine Griezmann in search of goals and support for Lukaku.
Newspapers claimed that the transfer was all but done. But the deal that looked inevitable, collapsed out of the blue. The Roji Blancos were facing a transfer ban having failed to comply with the transfer norms.
In times of crisis, Griezmann decided to stick with the club that helped him to become the superstar we know today. He knew Atletico would not be able to replace him due to the transfer ban, so he decided against the move and stayed at Atletico pledging his loyalty to the club and fans.