"Video games have become the new comic books for Hollywood right now," he said.
"After the huge success of Minecraft, Mario and Sonic at the box office, plus Fallout and The Last of Us on the smaller screen, movie producers have been scrambling to sign all sorts of games, from the biggest proven brands to entirely unproven properties that haven't even come out yet."
Elden Ring is "one of the most critically acclaimed fantasy games out there", he said, with more than 30 million players and the involvement of Game of Thrones author George RR Martin, who helped create its original story. "So it has a lot going for it."
But he added: "We have seen plenty of game adaptations fail to succeed on the big screen, including last year's Borderlands movie, which had a strong cast and was directed by Eli Roth. But it's very much the trend, and it's only growing."