FIFA took the measure to fine the Danish Football Association $20,400 after Danish fans were found to have displayed banners deemed as sexist during their Group C encounter with Australian on Thursday.
A statement issued by FIFA on Sunday said that Danish fans had thrown projectiles at Australian fans during the 1-1 between the two sides in Samara three days ago, Reuters report.
The Danish Football Association have not yet issued a comment in relation to the disciplinary measure.
Denmark currently sit in second place in Group C on four point, two points behind leaders France and three ahead of third-placed Australia. Peru failed to register a point in their first two games.