“Anyone who knows us knows that we revel in sibling rivalry. This will be no exception... We have wrestled eyeballs off Today this year, and Karl is going to have to work his backside off to get them back. I'll be doing my best to stop that,” Peter told the publication.
The pair are famous for their good-humoured sibling rivalry, and Peter joked that he would be giving Karl tips on how to readjust to the early morning wake-up calls.
“Let me put it this way. In 2001 the great Alfie Langer led Queensland to victory in the third and ¬deciding Origin game,” Peter joked.
“It was a truly epic sporting comeback. Karl will need to invoke the legend of Langer, and I know he'll give it a great crack.”
Speaking to The Sydney Morning Herald on Friday, Karl confirmed the rumours he was making a return to Today.
"It's not something I thought would ever come up again. I thought my time was up, but then, when I was sounded out about it, it got me thinking. It's a big job with enormous pressures and I know only too well some of those pitfalls, but it is also without question the best live TV job in Australia."
After getting unceremoniously dumped by the Network while on his honeymoon with his second wife Jasmine Yarbrough in December, Nine's cash cow will return after ratings slumped on the breakfast show in his absence.
And it means that Today's first all-female line-up - Georgie Gardner and Deb Knight - are out.