US hiker Sarah Shourd and her two friends – Josh Fattal and Shane Bauer – were arrested in July 2009 for illegally entering Iran.
Shourd was released on bail of around $500,000 last year due to her failing health, while Fattal and Bauer remain jailed in Tehran.
She has been summoned by the Islamic Revolutionary Court to attend a trial session scheduled Feb 6, judiciary spokesman General Gholam-Hossein Mohseni-Ejei said.
The three have been charged with espionage.
Mohseni-Ejei had said in November last year that Iran would put Fattal and Bauer on trial after Shourd was brought back to the country.