Abd El-Fattah was found guilty of spreading false information for sharing a Facebook post, a charge frequently used against activists and those of suspected of dissent.
Abd El-Fattah has been on a hunger strike for more than 200 days and on Sunday stopped drinking water.
British Prime Minister Rishi Sunak on Wednesday said that he had raised the case of Abd El-Fattah while attending COP27.
In January, Egyptian-Palestinian activist Ramy Shaath was freed following more than 900 days in detention after he renounced his Egyptian nationality.
The only explanation his supporters have, Bahgat said, is that Abd El-Fattah was “one of the most prominent and influential voices” of the 2011 Arab Spring uprisings.