Mirzayanov predicted that Navalny would eventually recover.
"Navalny will just have to be patient but in the end, he should be healthy," Mirzayanov said, predicting recovery would take "almost a year".
He suggested that Navalny most likely took in the poison by mouth since he appears not to have contaminated others.
This counters a suggestion by another scientist who worked on Novichok, Vladimir Uglev, who told Proyekt investigative site that Navalny's survival suggested he had only skin contact.
Navalny's aides gathered discarded objects from his hotel room in the Siberian city of Tomsk and sent them to German experts who found Novichok on a water bottle.
Russian scientist Leonid Rink, who state media says worked on the program to develop Novichok, poured scorn on Mirzayanov's comments on Sunday.
Speaking to the RIA Novosti news agency, Rink said Mirzayanov, while he worked at the same research center, was an "ordinary" chemist not directly involved in Novichok's creation.
"He has nothing to do with the creation of Novichok," Rink insisted, adding Mirzayanov could not know its "biological effects".
Rink argued that if Novichok had been used on Navalny, the opposition leader would have died.
"He wouldn't have survived if it was Novichok," he said.
(Writer & Editor: AM/PMA, Agence France-Presse)
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