Los Angeles, March 6: Veteran actor Sylvester Stallone will reportedly star in the sequel of Marvel's superhero film "Guardians of the Galaxy". The actor was spotted heading to the sets of "Guardians of the Galaxy Vol. 2" at Pinewood Studio in Georgia, Atlanta and holding what looks like a script, reports aceshowbiz.com. While Stallone's involvement in the film is yet to be confirmed, a photograph of him exiting a hotel in Atlanta surfaced via NY Daily News. The movie's cast has been staying at the hotel while filming is taking place. Stallone was spotted getting into a car that was usually assigned to the movie's star Chris Pratt. The film will release on May 5 next year.