McGroarty was reassigned to AHL Wilkes-Barre/Scranton on Wednesday.
McGroarty recorded one goal (on his lone shot) and added two assists in Friday's 7-3 preseason win over the Blue Jackets.
McGroarty signed a three-year, entry-level contract with the Penguins on Thursday.
McGroarty was traded to the Penguins by the Jets on Thursday in a swap for Brayden Yager, the Pittsburgh Post-Gazette reports.
McGroarty (chest) will captain Team USA at the World Junior Championship, Scott Billeck of the Winnipeg Sun reports.
McGroarty was selected 14th overall by the Jets in the 2022 NHL Entry Draft on Thursday.