The Duke of Cambridge quizzed double Tour de France winner Chris Froome on whether he was a "sucker for punishment" ahead of the cyclist's defence of the title.
The 30-year-old was awarded an OBE in the New Year's Honours list for services to cycling following his achievements in the saddle.
The Team Sky rider became the first British cyclist to win the Tour de France twice after triumphs in 2013 and last year.
Speaking afterwards, Froome said William told him he had followed his career.
"He said are you going to try and go for number three this year and I agreed," Froome said. "He did ask if I was a bit of a sucker for punishment that I keep coming back year after year to try again."
This year Froome will aim to defend the yellow jersey by winning Le Tour again as well as taking on the Olympic road race, Olympic time trial and Vuelta a Espana.
He said there would be "no big party" to celebrate his honour as he had a "wind tunnel session early tomorrow morning" as part of his training.