Saipa lost 5-1 to Tractor in the final day of the IPL in Tabriz and was relegated from the top-flight league.
The Tehran-based football team joined Machine Sazi, who had previously been relegated from IPL.
Persepolis won the title for the fifth successive time, followed by Sepahan and Esteghlal.
Fajr Sepasi and Havadar secured promotion to the IPL last week.