Rehfuss reunites with head coach Kayla Treanor after serving as her offensive coordinator at Syracuse in 2024.
The defensive end picked up the injury working out at home over summer break.
Ott will be the only head coach in the NBA with ties to Penn State.
The Nittany Lions will look to win their fourth straight AHA Championship.
Colangelo joins the Nittany Lions after six years with Villanova.
Johnson will join Kieger's coaching staff after being an assistant coach at the University of Miami.