The 31-year-old was removed from the firing line after the Blades made it 1-1 at Anfield.
However, the Reds remained calm and eventually got their reward, going on to win 3-1.
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Salah, who did score in their previous game, was likely being rested for upcoming matches.
However, the Egyptian was visibly upset and annoyed at being removed with the game on the line.
Darwin Nunez, Alexis Mac Allister, and Cody Gakpo got the goals for the Reds.