The Swiss Football League (SFL) also said that one player suffered racist abuse during the incident.
Lucerne were winning 4-0, a result which would have condemned Grasshopper to relegation after 68 years in the top flight, when several dozen visiting fans threatened to storm the pitch and forced the match to be called off.
They demanded that Grasshopper players hand over their shirts and socks as they were considered not worthy of wearing them. Some shirts were handed over after negotiations with club officials.
The SFL said that two supporters who attacked a Grasshopper player had been banned along with three others who entered the pitch. It said that 57 offenders had been identified and all would eventually be sanctioned.
"Particularly shocking was the physical and verbal attack against a dark-skinned player," said SFL chief executive Claudius Schaeffer in a statement. "We must all act together vehemently against racist thinking and any kind of discrimination."
Although the result has yet to be confirmed, 27-times Swiss champions Grasshopper have already accepted their relegation.
(Writing by Brian Homewood; Editing by Toby Davis)
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