"We will begin enriching uranium to five percent at the Fordow facility tomorrow," he said, as cited by the Iranian Students News Agency (ISNA).
According to Salehi, before making a nuclear deal, Iran used to enrich uranium to 20% in Fordow. "Today, we have enough 20% enriched uranium," he added.
Salehi also pointed out that gas would be injected into uranium enrichment centrifuges in the presence of International Atomic Energy Agency (IAEA) officials.
Earlier on Tuesday, Iranian President Hassan Rouhani announced that Tehran would take the next step to reduce its commitments under the Joint Comprehensive Plan of Action (JCPOA) by activating centrifuges at the Fordow uranium enrichment plant on Wednesday.