Doctors say former President George H.W. Bush needs to "build up his energy" before he can be released from a Houston hospital.
Methodist Hospital spokesman George Kovacik said in an email statement Sunday that doctors are still optimistic that the 88-year-old Bush will make a full recovery.
He said doctors are being "extra cautious" with Bush's care.
Bush was hospitalized Nov. 23 for treatment of a bronchitis-related cough. Hospital officials have said Bush has been receiving physical therapy to increase his strength.
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On Thursday, Bush spokesman Jim McGrath said Bush could be released in time for Christmas. But Kovacik said in Sunday's statement that a discharge date has not been set.