The 45-year-old has emerged as the leading candidate to replace Jurgen Klopp at the end of the season
The Canada international played alongside one Los Blancos favourite during his spell at Blackburn.
Feyenoord will demand significant compensation for the man who guided the Dutch club to their first title in six years.
Jamie Carragher is concerned the Liverpool job Arne Slot could inherit has become a "huge jump" compared to when Jürgen Klopp took charge due to his incredible success