NFL Network Insider Ian Rapoport reported Peters was fined over $13,000 for grabbing his crotch during the touchdown celebration, per a source informed of the punishment.
Jordan Schultz of Yahoo Sports first reported the fine.
Speaking to reporters after practice Friday, Peters didn't seem to regret his actions.
Peters intercepted Derek Carr late in the fourth quarter Monday night and scampered 50 yards for the game-sealing score. Upon reaching the end zone, the corner leaped backward and grabbed his crotch, a move Lynch had been fined for in the past.
Other fines handed down on Friday: