The 23-year-old is also closely watched by Barcelona, Atletico Madrid and Manchester City.
Ruiz was instrumental behind Napoli finishing second in the Serie A table last season, racking up 5 goals and 3 assists in the process. Furthermore, he won the UEFA U-21 Golden player award for helping the Spanish national team to lift the U-21 title.
It is also reported that the ex-Real Betis man has no desired buy out clause in his contract, which is set to expire in 2023.
Los Blancos have been linked with a string of midfielders, including the likes of Donny Van de Beek,
are spending their loan spells with Real Sociedad and
’s man picked up two hard-fought draws against Barcelona and Athletic Club and are currently second in the La Liga table.