"I'm going to do the next one with no teeth," Ferguson said.
"It always feels better that way," Lewis replied, smiling.
The studio audience were heard groaning as soon as the league legend made the comment, but then broke out into applause. The cameras cut to female co-host Erin Molan, who was visibly shocked at the comment, as she sat open-mouthed on a couch nearby.
The response from many on social media was swift, with several fans condemning the league immortal for his poor taste.
But while there was some criticism on social media, others praised Lewis for bringing some much needed humour to the programme.
Lewis is part of Channel Nine's rugby league coverage and is also on Nine News Brisbane.
It remains to be seen if any action is taken by Nine officials.
The Footy Show has moved to a later timeslot this season, with Thursday night football meaning the panel show regularly doesn't go to air until after 10pm.
But it is not the first time this year that the programme has caused outrage. Another league legend, Tommy Raudonikis, used offensive language on the opening episode.