Daniel Radcliffe ''can see why people are frustrated'' over Johnny Depp's casting in Fantastic Beasts: The Crimes of Grindelwald.

54-year-old Depp has reprised his role as Gellert Grindelwald in the sequel, but some fans have hit out at the decision to bring him back for the next movie because of his controversial divorce from Amber Heard in 2016.

When the reports first surfaced producers did consider recasting the villain but later decided against it because the allegations had been dropped.

Amber Heard and Johnny Depp

Speaking to Entertainment Weekly, Radcliffe says he understands why fans aren't impressed with the decision.

''It's a very hard thing for me. The Fantastic Beasts producers are the ones who gave me a great start in life and an amazing job.

''I can see why people are frustrated with the response that they were given from that ... I'm not saying anything that anybody hasn't already said -- and this is a weird analogy to draw -- [but] in the NFL, there are lots of players arrested for smoking weed and there is other people's behaviour that goes way beyond that and it's tolerated because they're very famous players.

"I suppose the thing I was struck by was, we did have a guy who was reprimanded for weed on the [original Potter] film, essentially, so obviously what Johnny has been accused of is much greater than that.''

Fantastic Beasts: The Crimes of Grindelwald is scheduled for release in November 2018.