"It was very painful," the Chelsea winger said. "That [pelvic] bone is there for a reason, to protect you, but I hit it well!
"It was sore but it’s getting better. I’m just kind of seeing how I’m feeling, taking it day by day.
"Right now I’m doing everything in my power to be able to be out there on the field on Saturday."
Pulisic picked up the injury at the moment when he scored his team's only goal against Iran in the 1-0 win that helped them qualify for the knockout stage.