"Totally deny it. I don't know where this is coming from," Muschamp said.
And Chizik, who was dismissed as Auburn's coach last fall, denied payments were made to players or grades were changed, among other allegations in the roopstigo.com report.
"Ms. Roberts' story is long on accusation and inference, but short on facts and logic," Chizik said in a statement, posted on al.com.
"It is noteworthy that the story comes just days before a player mentioned most prominently in the article is set to go to trial for felony armed robbery," he added, referring to McNeil. "The statements are very generalized accusations devoid of substance."