Fears have been raised over the political future of the 58-year-old president who has already had three cancer operations in Cuba since the middle of last year.
News of more surgery will likely raise new doubts about his political future and the fate of his self-styled "revolution" in the OPEC nation.
In his comments on Saturday, Chavez sat alongside members of his Cabinet, including Vice President Nicolas Maduro and Congress head Diosdado Cabello, two close and powerful allies who might look to replace him if Chavez were to leave office.
More top news
The Team Sky cyclist took the lead in the past few days and confirmed his place as the first British winner of the Giro d'Italia
Cooler towards the northeast coast with low, misty cloud developing.
The county was the only constituency in the Republic to vote no in Friday’s abortion referendum.