The Saints' season finished with a win over Fremantle on Sunday.
Dwarf entertainer Arthur Serevetas said he and colleague Blake Johnston, who performs under the moniker Mr Big, were hired to perform for players on Monday.
He said Johnston had his clothing set alight.
"A player went behind my friend with one of those gas lighters that you light up a stove and basically lit him up," Serevetas told the Nine Network's Footy Classified on Monday night.
"Part of his shirt and pants caught on fire.
"After that someone put it out and he got ticked off and we basically left.
"That was the end of our gig basically."
Serevetas said he had urged Johnston to seek some form of compensation.
"I said in my opinion I think you should pursue it, I think you should get compensated at least for your shirt and pants and I told him to make sure he checks that his skin didn't get burnt or anything like that," Serevetas said.
"In my line of work we do things that cross a certain line or boundary but this is beyond."