US special envoy for hostage affairs Adam Boller told CNN that another American citizen will be released on Wednesday, Reuters reported, quoted by BTA.
When asked to reveal more details about the identity of the American citizen, Boller replied: "it will be a surprise".
Russia released American teacher Mark Fogle on Tuesday after an unannounced visit by US special envoy Steve Witkoff to Moscow.
A CNN reporter asked Boller if this was another person detained in Russia. "I can't comment", the US special envoy for hostage affairs said.