Scotland duo join Glasgow injury list ahead of Ospreys clash
Darge underwent ankle surgery earlier this week after going off injured during last weekend’s 52-24 victory over Cardiff.
Steyn is out with a hamstring injury while Fagerson picked up a rib knock in midweek.
Rufus McLean replaces Steyn on the wing following injury, while Sam Johnson makes his first appearance of the season at inside centre.
Ollie Smith and Ross Thompson have not made the squad after returning to training this week following back injuries.
Head coach Smith told glasgowwarriors.org: “Last weekend’s performance against Cardiff was another step forward in our journey – our systems clicked and we won playing our brand of rugby.
“We want to make another step forward when we take on an experienced Ospreys side.
“It’s great to be able to bring Sam, Rufus and Gregor into the starting XV. They all have worked hard in training and have earned their chance to pull on the jersey.
“Ospreys have threats across the park and once again we will need to be ruthless in the contact area and clinical in attack in Swansea.”
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