Venezuelan President Hugo Chavez is heading back to Cuba on Sunday, December 9 for more surgery for cancer, announcing on television that the illness has returned after two previous operations, chemotherapy and radiation treatment, AP reported.

Chavez acknowledged the seriousness of his situation in an address Saturday night, saying for the first time that if he suffers complications Vice President Nicolas Maduro should take his place as Venezuela's leader and continue his socialist movement.

Outside medical experts said that based on Chavez's account of his condition, he is facing a very difficult fight against an aggressive type of cancer.

The president, who just returned from Cuba early Friday, said tests had found a return of "some malignant cells" in the same area where tumors were previously removed.

Chavez, who has yet to be sworn in for his new term after winning re-election on Oct. 7, said he would return to Havana on Sunday and would undergo the operation in the coming days.