Boris Johnson must now use all his energy to get Nazanin Zaghari-Ratcliffe released, according to Amnesty International UK.
The foreign secretary has said his comment on Zaghari-Ratcliffe could have been clearer, and has said he is sorry if his words were taken out of context "to cause any kind of anxiety."
Zaghari-Ratcliffe is currently being held in Iran for allegedly trying to overthrow the government, despite being on holiday and not working as a journalist during her time in the country.
It has been claimed that the Iranian government may use Johnson's comments to extend her current five-year prison sentence.
Kerry Moscogiuri, campaigns director at Amnesty International UK, told Sam Delaney: "Where all of our focus needs to be is on Nazanin [Zaghari-Ratcliffe] herself.
"The important thing now is [Johnson] puts all of that energy into trying to get her released. So what we really want to see him do is to say 'right come on, I’m going to get this right now and I’m going to get myself over to Iran before Christmas. I’m going to meet Richard Ratcliffe her husband and I’m going to do everything I can to get Nazanin home'."
She added that Zaghari-Ratcliffe has "been put in solitary confinement. She’s had a terrible ordeal. Her health has really suffered."
She has called on the public to help encourage MPs and Johnson himself to get the woman home as well as use Amnesty International's website to express solidarity for Zaghari-Ratcliffe as "when she gets messages of support it makes a massive difference to her."
Listen to the full interview above