Sharp, who was famous for his mullet haircut in the '80s and '90s, will step into the jungle if one of the original lineup pulls out, walks or suffers an injury, according to The Sun.
The DJ and TV presenter is most famous for hosting children's series Fun House for over a decade on CITV. He also fronted What's Up Doc?, The Roxy and now presents on Smooth Radio.
Stars rumoured to be taking part this year include The Only Way Is Essex's Mark Wright, Olympic athlete Fatima Whitbread, McFly's Dougie Poynter and comic Freddie Starr.
Ex-Emmerdale actress Lorraine Chase has also been spotted in Australia along with jockey Willy Carson.
I'm a Celebrity launches on Sunday after The X Factor on ITV1.
> DS Icon: Pat Sharp