The Reds have been hamstrung by injuries in recent months with Leny Yoro, Lisandro Martinez and Harry Maguire just three defensive options who have been sidelined as of late.
Mason Mount made the bench against the Foxes on Sunday evening and, given Ruben's admiration for the former Chelsea man, he could soon stake a claim.
Amad is also a player who has been touted for a potential early return, but who else is the boss keeping a keen eye on?