Terra Nova actor Dean Geyer will play Brody, a handsome older student at NYADA who shows an interest in Rachel (Lea Michele), TVLine reports.
Meanwhile, Jacob Artist will play Puck's (Mark Salling) younger half-brother Jake.
The title of Glee's season four premiere was revealed last week.
Michele has teased the "challenging dynamic" between Rachel and Kate Hudson's dance instructor, and has lamented the fact that the new season sees her share less screen time with Finn (Corey Monteith).
The fourth season of Glee will debut on Fox in the US on September 14. In the UK, the show airs on Sky1.
Watch the cast discuss season four at Comic Con below: