Westfield, a defender, had been signed to play for the Nittany Lions since December 2023 but will now be ineligible to play NCAA soccer.
Olivia Damico, Rowan Lapi, Devon Olive, and Mieke Schiemann will lead the team through the fall.
Biro signed with the Buffalo Sabers as an undrafted free agent in 2020 and played four seasons for the franchise before heading west.
Penn State finished with 827.75 points, behind Ohio State, Michigan, and Nebraska in the Big Ten.
Krieger will partner with Sebastian Salazar, co-host of Futbol Americas.
Aire averaged 4.8 minutes, 0.6 points, and one rebound per game with the Nittany Lions.