Harry will forgo his remaining NCAA eligibility.
Cecere will arrive in Happy Valley with one year of eligibility remaining.
Audet will serve as the first commit to Gambino's program following his hiring on July 3.
Scott Loiseau, Will Jauss, and Nick Puccio have all been added to head coach Mike Gambino's coaching staff.
Charleston is Reedy's third professional club since he joined the Real Monarchs in 2022.
The blue and white will take on reigning National Champion Syracuse on Friday, September 1.