"Were you on the phone?" Steve joked.
"I see where you're going with this. Can I get one of those dump buttons?" Karl laughed.
Adding: "I was on the phone actually, I was speaking to my brother [Peter], who's in very good health at Sky News."
Karl's private life was blamed for the Today show's falling ratings, which ultimately led to the host's departure from the breakfast TV show.
And a leaked conversation between himself, his brother Peter Stefanovic and Sylvia Jeffreys in the back of an Uber in 2018 was the final nail in the coffin for his career.
Speaking of his demise on 2GB in July, the dad-of-three said "you've just got to plough on".
"The problem is that some people do believe [the reports], and with the fullness of time, you've got to hope that they don't."
The TV host is set to make his Channel Nine comeback this month as he returns with This Time Next Year, which will air on August 12.