Larsen's fellow winner Damian McGinty has already appeared in the show as Rory and his stay has been extended past the seven-episode arc he was originally given.
Glee star Cory Monteith has now confirmed that Larsen has arrived on set and will first appear on screen in the Valentine's Day episode.
"He's here today," Monteith told TV Guide. "I can confirm he's here, but we haven't been formally introduced yet."
Monteith revealed that Larsen has a "very interesting role" which "ties into a lot of pre-existing storylines".
"It feels very natural," he added. "It's a smart way to bring him into the show. I hear he's very talented."
Earlier this week, The Glee Project was officially renewed for a second season by Oxygen.
Watch Samuel Larsen performing 'Don't You Want Me' with fellow contestant Marissa von Bleicken on The Glee Project below: