Salah came off in the 59th minute, clutching his left leg as he sank to the turf on the edge of the penalty area. He left the pitch to a standing ovation from all four sides of Anfield, clapping supporters as he walked down the tunnel. His expression told its own story — wry, resigned, uncertain.
"Another win and another injury. It's the story of our season," Slot told BBC Sport after the game.
"It's too early to say but we all know Mo and how hard it is for him to leave the pitch. If we were 6-0 up and I take him out two minutes before the end, he's still like 'I could have scored two more'. For Mo to leave the pitch, that tells you something, but we have to wait and see how bad it is."
Slot added that Salah's meticulous approach to self-care gave him reason for cautious optimism.
"Mo has taken such good care of his body that he will have the minimum time required to recover from an injury and let's hope for the best that he's available for the last part."
Tim Sherwood voiced wider fears on Soccer Saturday. "This could be the end of him in a Liverpool shirt. You can see him grab his left hamstring. What a sad end for him. What an ovation there will be for him."
Salah has four games remaining in which to feature. Liverpool confirmed last month he will leave when the season ends, bringing a nine-year stay to a close. He has made 440 appearances for the club and scored 257 goals — the third-highest tally in Liverpool's history.
Hamstring injuries typically require between three and eight weeks to heal. Liverpool's final home game, against Brentford on 24 May, is the match earmarked as Salah's farewell. Whether he makes it remains to be seen.