#5 Ander Herrera
The Spaniard was a long-term target for the club before joining the Red Devils in 2014. He has been a priceless asset in the engine-room for United. He has been deployed in various roles in the midfield.
The midfielder was in sublime form in Jose's first season in charge at United. He won the club's Player of the Year award in 2016.
He was expected to feature regularly in a three-man midfield for United after Matic's arrival. However, the 28-year-old lost his place in the starting XI.
Herrera was a subject of interest from FC Barcelona in 2017 but the Spaniard decided to commit to his current club.
He is yet to agree on a new deal at the club, as United have triggered an extension of one year in his existing contract.
However, his worth has steadily been increasing at the club as he has delivered whenever called upon. He has made 36 appearances in all competitions this season despite being on the bench for a majority of the time.