The statement by the foreign physicians who visited China's most prominent democracy advocate looked likely to add to international pressure on China to release him for treatment overseas.
The First Hospital of China Medical University in the northeastern city of Shenyang, where Liu is being treated for late-stage liver cancer had said Saturday it was "unsafe" for him to travel due to his deteriorating condition.
But American oncology expert Joseph Herman from the University of Texas' MD Anderson Cancer Center, and German doctor Markus Buchler of Heidelberg University, who visited Liu yesterday, said otherwise.
"However, the medical evacuation would have to take place as quickly as possible."
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Their statement added that both of their respective institutions had agreed to accept Liu for treatment.
Beijing has come under fire from human rights groups over its treatment of the activist and for waiting until he became terminally sick to release him from prison more than a month ago.
Liu, 61, and his family want him released to seek treatment abroad.
"The statement by the two experts shows that the Chinese authorities lied when the hospital released the statement yesterday," Amnesty International China researcher Patrick Poon said.
"The Chinese government should face it instead of covering up and faking news any more. They should respect Liu Xiaobo's wish to leave the country before it's too late.