United Kingdom, Feb. 13 -- John Lithgow is in final negotiations to play the role of Professor Albus Dumbledore in the 'Harry Potter' TV series.

The 79-year-old star is said to be close to a deal to portray the Hogwarts headmaster in the HBO small screen adaptation of J.K. Rowling's wizardry book series, although the network are refusing to comment on the speculation.

HBO said in a statement: "We appreciate that such a high-profile series will draw a lot of rumour and speculation.

"As we make our way through pre-production, we will only confirm details as we finalise deals."

John will be taking on a role that was played by late actors Richard Harris and Sir Michael Gambon in the film franchise.

The 'Harry Potter' series is designed t...