The group were reportedly heard chanting "Salah is a bomber", and three supporters were subsequently turned away from the Sinobo Stadium in the Czech capital after the video.
Fans were sent into a frenzy on social media after footage appeared to show Liverpool midfielder Fabinho "snotting" in the direction of Chelsea talisman Eden Hazard while he laid on the ground.
Five years ago Chelsea played a pivotal role in ending Liverpool's Premier League ambitions when a run of 11 consecutive Premier League victories was ended at Anfield.
Too often, though, the Belgium worldwide was left to do it all on his own and he got little change out of Virgil Van Dijk until the hour mark when his side were 2-0 down. Emerson, Chelsea's left back, had no idea how to stop him, and was given...
Earlier, Raheem Sterling scored twice and Gabriel Jesus sealed the win in injury time to send City briefly one point clear of Liverpool.
It was Salah's first goal in six appearances at home and could not have been better timed. If he plays his best game, we have to deal with that.
Hazard spurned two glorious opportunities in as many minutes as Chelsea briefly threatened to rally.
Antonio Rudiger hurt a knee in a challenge with Mane but was able to continue, and then Liverpool attacked again, Jordan Henderson's shot deflected to safety.
Van Dijk insists Liverpool must keep their focus, with the Champions League also on their agenda.
FW Willian, 7 - Managed to create Chelsea's only real opportunity of the first half, surging onto Luiz's pass, cutting infield from the left and shooting just wide.