Deputy Commander of the Iranian Revolutionary Guard Ali Fadawai said if their forces were present in Yemen, the Houthis would take control of Saudi capital Riyadh.
In an interview with the Iranian IRIB TV 3, Fadawi said the blockade imposed on Yemen by a Saudi-led coalition is preventing Iran from sending forces to Yemen to support the Houthis.
He confessed that his country is supporting the Houthis with anything possible, saying "That is a duty imposed by Quran".
"We are not available in Yemen. If we were there, the Houthis would control Riyadh. If Iran reached the Houthis, the situation would change".
"As long as the Houthis are besieged, we can't help them. They are managing everything for themselves. And we, in accordance with Quran, are offering anything possible to help. We do it. But the Houthis have built their won capabilities".
The Saudi-led coalition, which launched a bombing campaign against Yemen in March 2015 to restore the internationally recognised government of president Abdrabbuh Mansur Hadi, the USA and other western countries and the Arab League are accusing Iran of providing military support to the Houthi Group, also known as Ansar Allah during the civil war. Iran has always denied the accusation.
Yemen has been battered by a five-year conflict between the government of president Hadi backed by the coalition and the Iran-backed Houthis. The Houthis have been controlling the capital Sanaa since they ousted the government in late 2014.
Two summits that were held in Saudi Arabia on Thursday said Iran is interfering in affairs of regional states and backing terrorism including providing support to the Houthis in Yemen.