The `Game of Thrones` actor and former Dr. Feelgood guitarist has opted not to receive chemotherapy treatment and is said to be in "good spirits" following the diagnosis.
Wilko`s manager Robert Hoy announced the news via the actor`s Facebook page, writing: "I am very sad to announce that Wilko has recently been diagnosed with terminalcancer of the pancreas. He has chosen not to receive any chemotherapy.
"He is currently in good spirits, is not yet suffering any physical effects and can expect to enjoy at least another few months of reasonable health and activity."
The 65-year-old actor-and-musician found fame in the 1970s as a member of pub rock band, Dr. Feelgood, and currently stars on hit fantasy drama `Game of Thrones` as mute executioner Ilyn Payne.
His manager is adamant Wilko will continue to live life to the fullest despite his battle with cancer, making new music as well as touring Japan and France, "followed by a series of farewell gigs in the UK".
Robert added: "Wilko wishes to offer his sincere thanks for all the support he has had over his long career, from those who have worked with him to, above all, those devoted fans and admirers who have attended his live gigs, bought his recordings and generally made his life such an extraordinarily full and eventful experience."