Iran, the top-ranked team in Asia, hosts Cambodia at the 78,000-capacity Azadi Stadium in Tehran on Oct. 10.
Infantino has been urging Iran's government to lift the 40-year ban imposed after the Islamic Revolution.
FIFA's statutes prohibit discrimination by member federations, and could allow for Iran to be suspended from international soccer.
"Our position is clear and firm. Women have to be allowed into football stadiums in Iran," said the FIFA president, who previously got assurances at a March 2018 meeting with Iran's President Hassan Rouhani.
Iran briefly relaxed its rule last November when hundreds of women were selected to attend the Tehran stadium for the Asian Champions League final second leg game.
Infantino's latest attempt to put pressure on Iran did not impress the Open Stadiums women's group which is campaigning to end the ban.
"This is even softer than previous letter to Iran and still is talking only about worldcup qualification matches," the group said on its Twitter account. "Sahar's death and activists in danger didn't change FIFA's action, they need process and steps for any actions!"
Open Stadiums noted this week that judo's world governing body has suspended Iran's national judo federation for government interference. Iranian athletes are typically prevented from competing against opponents from Israel. The president of Iran's judo federation, Arash Miresmaeili, called the suspension "hasty and unfair," semi-official Mehr news agency reported Wednesday.
FIFA has officials currently in Iran monitoring preparations at the venue should the soccer ban be lifted.
"We understand there are steps and processes that need to be taken before this is done in a proper and safe way," Infantino said.
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