Asier Illaramendi
The central midfielder reportedly grew unhappy with life at Real Madrid after being largely marginalised from the first team under Carlo Ancelotti.
It remains to be seen whether the deep-lying playmaker will be a key figure under Benitez, but the ex-Liverpool coach could see Illarramendi as a good bargaining chip as they look to seal De Gea. He could prove to be an ideal long-term successor to Michael Carrick.