Nick Frost, Paapa Essiedu, Janet McTeer and Paul Whitehouse will appear in the forthcoming Harry Potter TV series, US network HBO has confirmed.

Frost has been cast as Hagrid, McTeer will play Minerva McGonagall, and Essiedu will portray Severus Snape. All three were reported to be in talks with the network in recent weeks.

HBO have now formally confirmed their casting, and announced that Whitehouse, well known for the Fast Show and Harry & Paul, will play Argus Filch.

The network also confirmed John Lithgow's announcement in February that he will play Hogwarts headmaster Albus Dumbledore.

The show is due to begin filming this summer, with the first series airing potentially as early as next year.

The actors playing Harry Potter, Ron Weasley and Hermione Granger have not yet been cast.

HBO launched an open casting call for the three lead roles, which reportedly attracted more than 30,000 submissions.

Who are the confirmed actors?

Janet McTeer will play Professor McGonagall, the character portrayed by the late Dame Maggie Smith in the films

• John Lithgow, who will play Dumbledore, recently starred in the Oscar-winning Conclave, and has also appeared in 3rd Rock from the Sun, Footloose and The Crown. He won an Olivier Award last week for playing Roald Dahl in stage play Giant, which soon transfers to the West End
• Paapa Essiedu, who will portray Hogwarts teacher Severus Snape, shot to fame in the TV series I May Destroy You, and has also appeared in Gangs of London and The Lazarus Project. Last year, he starred in The Outrun with Saoirse Ronan, and will appear in a new stage production of Arthur Miller's All My Sons in the West End later this year
• Janet McTeer, who has been cast as Professor McGonagall, has appeared in films including Wuthering Heights, Albert Nobbs and The Menu, as well as the TV series Ozark and Jessica Jones. Later this year, she will be seen in Mission: Impossible – The Final Reckoning
• Nick Frost, who will play the friendly half-giant Hagrid, is best known for appearing in comedy films Shaun of the Dead, Hot Fuzz, The World's End and Paul. His TV credits include Spaced and Into the Badlands, and he voices SM-33 in Star Wars: Skeleton Crew
• Paul Whitehouse, who will play Argus Filch, appeared in the BBC sketch comedy series The Fast Show and opposite Harry Enfield in Harry & Paul. He also appears in Mortimer & Whitehouse: Gone Fishing, with Bob Mortimer, while his stage credits include Only Fools and Horses The Musical
• Luke Thallon, who will play Quirinus Quirrell, has appeared in stage productions including Patriots, Albion and Tom Stoppard's Leopoldstadt. He is currently starring in a touring Royal Shakespeare Company production of Hamlet, playing the titular role

John Lithgow won an Olivier last week for his stage portrayal of Roald Dahl

Showrunner Francesca Gardiner and executive producer Mark Mylod said they were "delighted to have such extraordinary talent onboard, and we can't wait to see them bring these beloved characters to new life".

JK Rowling's phenomenally successful series of novels has previously been adapted into a film franchise starring Daniel Radcliffe as Potter.

The TV series, however, will have more breathing space to explore the plot lines from the books without the time constraints of the film.

Rowling will serve as an executive producer on the TV series, which HBO has said will be a "faithful adaptation" of her books.

Further casting announcements are expected to follow soon, with rumours swirling about other actors reportedly in discussions about joining, including Cillian Murphy as a possible Voldermort.