"Boston Rob" Mariano and Sandra Diaz-Twine will return to Survivor as mentors in the new season.

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The Hollywood Reporter confirmed Wednesday the former Survivor winners will coach contestants in Season 39, Island of the Idols, which premieres in the fall.

Mariano competed in Seasons 4 (Marquesas), 8 (All-Stars), and 20 (Heroes vs. Villains), and was victorious in Season 22 (Redemption Island). Diaz-Twine won Season 7 (Pearl Islands) and 20 (Heroes vs. Villains), and also appeared in Season 34 (Game Changers).

"I only came because Rob was coming," Diaz-Twine said of her return to the series.

"I always said I wouldn't come back to Survivor unless it was some kind of unique experience that made sense," Mariano added. "When [host] Jeff [Probst] pitched us the idea of us coming back as coaches or mentors, it rang true. I said, 'Why not?'"

Entertainment Weekly said Mariano and Diaz-Twine will answer questions and offer the 20 new contestants assistance on topics including strategy and shelter building.

"The basic idea is they run a Survivor boot camp. They teach aspects of the game and then give players a chance to test what they've learned," Probst explained.

Survivor released a teaser for Island of the Idols following the Season 38 (Edge of Extinction) finale Wednesday. Chris Underwood was named the Sole Survivor over Gavin Whitson and Julie Rosenberg.