Javier Hernandez (Bayer Leverkusen)
Fondly known as Chicharito, the Mexican international was in great touch in front of goal during his time at Old Trafford, but he could not find a place in the starting XI regularly. Hence, he decided to move on in 2014. He spent a year on loan at the Bernabeu before sealing a £8m permanent switch to German outfit Bayer Leverkusen on the deadline day of 2015 summer window. Since then, he has been consistently productive in the Bundesliga and has 12 goals and 3 assists in just over 30 games in all competitions this season. United are currently looking for a top class striker who can play second fiddle to Zlatan Ibrahimovic next season and Chicharito could have been the perfect man. He was sold for a cheap price and Mourinho will know that it was a mistake from the Red Devils, letting the 28-year old leave in his prime.