"I'm never going to close the door; that would be a stupid thing to do," he tells The Hollywood Reporter, "but I think I'll be happy enough and secure enough to let someone else play it (the role of adult Potter).

"At the moment it’s not even a concern because I'm too young to play the character, but even in 10 years' time I would still feel strange about going back to it."

Harry Potter and the Cursed Child, which is set 19 years after the events depicted in Harry Potter And The Deathly Hallows - Rowling's last book in the Potter series, has been a big hit on the London stage and insiders claim there's talk of it becoming a movie. It imagines Potter and his pals Ron Weasley and Hermione Granger as parents of a new generation of young wizards.

Radcliffe isn't sure it will be a good idea to mess with a hit film franchise, joking, "There’s a part of me that’s like, some things are better left untouched. If we went back to Potter, there’s a chance we'd make what Star Wars: The Force Awakens was to the original Star Wars, but there’s also the chance that we'd make (critically slammed sequel) Phantom Menace.

"I don’t want to go back to anything like that and maybe sour what people have already loved."

Daniel last played Potter in 2011's Harry Potter & the Deathly Hallows: Part 2.