The owner of Supercheap Auto,Rebel Sport and Macpac said sales in its outdoor goods divisions had been directly hit by bushfires and smoke haze.
Wesfarmers,Super Retail Group and Metcash all could witness a material change in their finances due to the devastating bushfires.
More than 45 local and international merchants have pledged all profits from Thursday's sales to bushfire victims in an effort to make a'real difference'.
The group's last three years of sales growth has been almost entirely fuelled by online shoppers.
Hopes of more breakthroughs in the Sino-US trade relationship boosted market sentiment on Tuesday,although gold miners were under pressure.
Shares in Super Retail Group have slid on Tuesday after the release of the company's first-quarter sales figures.
Super Retail Group has warned of additional costs to make up for the underpayment of store managers as it posted a rise in profits despite the retail recession.
Major JB Hi-Fi shareholders have warned retail investors to not get too comfortable.
Super Retail boss Peter Birtles has brought forward his departure date in recognition of the'significance of this underpayment'.
The company behind Rebel Sport and Supercheap Auto is ploughing millions of dollars into its digital offering.
The retail group that owns Rebel Sports,Supercheap Auto and Macpac has admitted to underpaying workers by almost $8 million after incorrectly calculating overtime pay and allowances.