Vin Diesel again hinted at his possible involvement in the upcoming Marvel Studios film "Inhumans."

Diesel changed his Facebook cover photo on Dec. 28 to a black-and-white picture of him standing in front of the tagline, "Are You Inhuman?" He also had the "Inhumans" title printed across the front of his black cutoff T-shirt.

The 47-year-old actor joined the Marvel universe as Groot in this year's "Guardians of the Galaxy" movie. The role of the sentient tree only requires Diesel's voice and he has one line, which he repeats over and over - "I am Groot."

The "Fast & Furious" star teased a possible role in the "Inhumans" movie, coming in 2018, back in August. He posted a photo of Groot to his Facebook and captioned it, "Vin and Marvel... you all made it happen! I get the strange feeling that Marvel thinks I'm Inhuman... Haha," according to ComicBook.com.

Rumors speculate Diesel would play the role of Black Bolt, the leader of the Inhumans in the Marvel Comics. When the character speaks, it creates a massive disturbance that could level a city so he trains himself to make no sounds with his voice.

He would become only the second actor to play two roles in the Marvel Cinematic Universe (MCU) after Paul Bettany, who voices Tony Stark's artificially intelligent computer J.A.R.V.I.S. and will play the new character Vision in the upcoming "Avengers: Age of Ultron." The two characters may be connected, though.

The "Inhumans" movie will premiere on Nov. 2, 2018, but the Marvel TV show "Agents of S.H.I.E.L.D." introduced the latest addition to the MCU in the second season fall finale earlier this month.

Diesel will reprise his voice-over role for Groot in "Guardians of the Galaxy 2" on May 5, 2017.