Iran has received an official invitation to join the Mecca Joint Defence Agreement and is considering the proposal, according to Mehdi Rahimi, head of the Iranian Parliament news agency.
The pact was signed on August 7 by Pakistan, Turkey and Saudi Arabia, and treats an armed attack on any one member as an attack on all three.
Bangladesh has also taken a positive approach to potentially joining the Saudi-Pakistan-Turkey framework, its new state minister for foreign affairs said in a Friday interview.
The outreach comes amid wider Middle East tensions and continuing US-Iran friction, with Donald Trump earlier welcoming the pact as a step toward stronger regional self-defence.