The No.11 had to be substituted seven minutes into the second half of the midweek Champions League victory over Manchester City.
Since then, the Reds’ medical department has been working closely with Salah to attempt to bring the Egyptian back into contention ahead of the trip to Goodison Park and the return leg against City.
“I don’t think it makes sense to talk here about what we do with the boys in rehab. But, of course, you can imagine we have tried everything to make him available,” said Klopp at his pre-match press conference.
“[There are] still 24 hours to go pretty much, or 23 hours to go until we start.