Liverpool suffer Salah blow in chase for Champions League
The Egypt forward was forced off at Anfield on Wednesday after scoring in Liverpool's 4-0 victory against Galatasary, which sealed their place in the quarter-finals of this year's Champions League.
In-form Salah, 33, has scored in three of his past four starts after an uncharacteristic lean spell.
"It's unusual," Slot said at his pre-match press conference on Friday. "As a result of that I think you can expect the outcome. So, (he's) not available for tomorrow."
Slot gave no timeframe for Salah's recovery.