The director recently sold his production company, LucasFilm, to bosses at Disney for a whopping $4.05 billion and the announcement came as a major shock to the entire film community - except for an elite few, including MCGregor, who starred in Star Wars: Episode I - The Phantom Menace, Episode II - Attack of the Clones, and Episode III - Revenge of the Sith.
The Scottish star tells U.S. Tv host Jimmy Fallon, "He let me know the night before that it was announced, which was nice."
Disney chiefs have revealed they will carry on the epic franchise by releasing Star Wars: Episode Vii in 2015, and the actor, who took over the role from the late Sir Alec Guinness - the original Obi-Wan Kenobi - would love to reprise his role if writers can find a way to make it work.
He continues, "There was always to be nine stories. He (Lucas) shot the middle three originally, we shot the first three, and then he told me that he wouldn't make the last three because he had other things planned... So I always thought that they wouldn't be made, but now that Disney have them... I think they'll be made...
"I would (do it), I would. I can only imagine I would be a hologram-type person because Alec Guinness can't do it now."
Lucas also gave original castmates Mark Hammill and Carrie Fisher a heads-up about the Disney sale.