Millar, who also wrote the Kick-Ass and Kingsman comics, was tweeted by a fan who reminded the writer he had correctly predicted the future twice in one of his comics.
In response, Millar posted: "Always remember I'm never wrong. PS Taron Egerton will be the next Wolverine."
Aussie actor Hugh Jackman announced he would be stepping back from playing Wolverine in 2017 after 17 years, prompting lots of speculation about who could be the next star to play the superhero.
And as far as authorities go on the whole superhero genre, they don't come much bigger than Millar, who wrote The Ultimates, which partly inspired Marvel's original Avengers movie; Ultimate Fantastic Four; and Wolverine: Old Man Logan, which was the inspiration for Fox's Logan movie.
Of course, Egerton and Millar have previously worked together, as the actor took up the role of Gary 'Eggsy' Unwin in Kingsman: The Secret Service and its sequel Kingsman: The Golden Circle, both based on comics by Millar, who was executive producer on the movies.
Rumours of Egerton becoming the next Wolverine have been swirling for a while, so much so that even the actor has addressed them, but it seems as though the modest star isn't so sure.
In an interview on Heart Breakfast, Egerton said: "That one, I think, is just a rumour. As far as I'm aware it's unfounded. I don't know if I'm quite grisly enough.
"I mean, if the people at Marvel think I am, then great, let's go. But I think there are better candidates. But I would love to be involved with that world somewhere."
The upcoming flick, due out in February, is a prequel to the two previous movies and centres on the origins of the spy agency.
But director Matthew Vaughan has already confirmed a fourth movie, which is confusingly referred to as Kingsman 3. It forms part of a trilogy alongside Kingsman: The Secret Service and Kingsman: The Golden Circle.
He's also revealed Egerton will be back in this movie, telling Digital Spy: "We've got to finish off the Eggsy and Harry relationship. The final chapter of their relationship needs to be told, which we've got ready to do, and I'm hoping to shoot that later this year or the beginning of next year."Featured Image Credit: PA