The British celebrity cook, who is currently visiting Australia to launch his Jamie's Italian restaurant in Sydney and to open another Ministry of Food, is believed to be filming a cooking challenge for the reality TV show tomorrow.
On Saturday night, Oliver hosted an exclusive dinner for 170 people at his Pitt Street restaurant, mainly local farmers and producers whose ingredients he has used to create his menu there.
MasterChef judge Matt Preston, who also interviewed Oliver for The Daily Telegraph during his brief Australian visit, said: "Although I've interviewed Jamie before and been a fan for a long time, this is the first time I've actually met him face-to-face.
"His measured and passionate activism about 'real food for real people' has informed much of how we approach MasterChef."
Preston recently revealed that this year's MasterChef will focus on the food rather than the contestants.
US chef Anthony Bourdain is also expected to appear in the upcoming season of MasterChef, as he is also in Sydney this week filming for his show No Reservations.
> Jamie Oliver: 'I want to help fight obesity in Australia'