The 22-time medallist will play himself in the upcoming third season of the series, Contactmusic reported.
In July, Phelps expressed his love for the show on Twitter calling the second season, "awesooommeee!!!"
The post helped land him the guest spot on the show, according to The Hollywood Reporter.
This will not be the first TV appearance for the Olympian, who has previously appeared on 'Entourage' and hosted US comedy skit show 'Saturday Night Live'.
--ANI (Posted on 29-08-2013)