Cabello's statement pointed to an impending legal dispute that would likely be resolved by Venezuela's Supreme Court, which is packed with justices appointed by pro-Chavez lawmakers.
Opposition leaders argue that the constitution does not allow for a president's inauguration to be postponed.
On Thursday, Maduro said Chavez has been with his family resting while receiving treatment for a respiratory infection.
In addition to the infection, the 58-year-old Chavez also suffered bleeding during the operation, which the government said was promptly stanched.
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