Abdulhadi al-Khawaja may be transferred to custody of country where he also has citizenship as protest enters 59th day.
Speaking to Al Jazeera on Saturday, Mohamed al-Jishi, Khawaja's lawyer, said his client's health was further deteriorating despite the hospital intravenous drip.
Jishi said the drip is only a saline/glucose solution.
"The doctors said this won't be enough to keep him alive. He is in a critical phase and he still needs to take food," he said.