The Scots actor played Kevin Wendell Crumb in 2016 sci-fi thriller Split, where he provided a stunning performance as a man with 23 different personalities. He has also portrayed X-men leader Charles Xavier in the most recent re-boot of the superhero franchise from Marvel.

But the actor posed the ambiguous question to fans on social media as to which character he was channelling. Some were convinced it was Kevin – ahead of next year’s Split sequel Glass, written and directed by M. Night Shyamalan. Others were sure the A-lister was teasing a follow as Professor X.

He posted a snap on Instagram saying: “Look who’s back… Kevin or Charles?” And some even thought it could be a nod to the storyline from Split as one of the personalities. The pic received more than 200,000 likes in less than 24 hours. And hundreds of people rushed to the update to praise McAvoy’s performance from both movies – as well as hit out with their excitement ahead of the new one.