A member of Russian punk protest band Pussy Riot is reportedly gravely ill after a possible poisoning.

Ekho Moskvy radio and online news portal Meduza reported on Wednesday that group member Pyotr Verzilov has been in emergency care since late Tuesday.

They quoted a fellow Pussy Riot member, Veronika Nikulshina, as saying Verzilov’s symptoms included losing his eyesight and ability to speak.

Pyotr Verzilov attended various conferences in Europe as an unofficial spokesman for Russian activist group Pussy Riot. Photo: Getty

Nikulshina said Verzilov was being treated in the toxicology unit of a Moscow hospital, indicating a suspected poisoning.

“When the paramedics arrived, he answered all their questions, saying, ‘No, I didn’t eat anything. No, I didn’t take anything’,” Nikulshina told Meduza.

“He was getting worse even faster, and then he started convulsing. On the way [to the hospital], in the ambulance, he was already babbling.

”He fell into such a half-asleep, half-unconscious state that he stopped responding to me and didn’t even recognise me anymore.”

Verzilov, Nikulshina and two other activists served 15-day jail sentences for disrupting July’s World Cup final.

They ran onto the field wearing police uniforms, briefly interrupting the match between France and Croatia. Pussy Riot said they were protesting excessive police powers in Russia.

-With AAP