#2 Alexis Sanchez
On January 2018, when Alexis Sanchez finally decided to leave Arsenal to win trophies, there was an apparent war between the two Manchester sides to get the services of the Chilean.
Sanchez's previous stint with Pep Guardiola made Manchester City the favorites to land him from Arsenal. However, with City reluctant to include any of their players in the deal, Jose Mourinho got his man with Henrikh Mkhitaryan going the other way.
The arrival of a world class player like Sanchez instilled a sense of hope among the fans. He was Arsenal's best player and hoped to repeat the same form with the Red Devils as well. However, his performances for United has been nothing but disappointing.
Alexis has looked a mere shadow of himself and failed to improve the squad a single bit. With Antony Martial getting back to form, his chances in the first team place are visibly cut short with reports emerging that he wants to leave in January, just one year after signing for the club.