England forward Gareth Ellis has announced his retirement from international rugby league with immediate effect, ruling himself out of the World Cup, which starts in just over four weeks' time.
The 32-year-old Hull second-rower reached his decision following consultation with England coach Steve McNamara and officials at his club, where he will now devote the rest of his career.
"It's no secret that I'm heading towards the latter part of my career and, after picking up untimely knocks over the last couple of years, I feel it is time for me to focus on my club," said Ellis, who has played 22 games for England, as well as winning 17 caps for Great Britain.
"It will allow me more time to rest up and recover before taking part in a full pre-season, something I haven't done since 2002, and hit the ground running in 2014.
"It's been something I've been thinking about for a long time and it's been a very tough call to make as I was always very proud to represent England and it will be extremely disappointing to miss the World Cup.
"I feel this could be the strongest England team for some years, but after 12 years I've had my opportunities on the international scene and I want to focus on a big year for Hull FC."
Ellis' decision comes 24 hours after the appointment of Lee Radford as Hull's new head coach and a week after the Black and Whites' season came crashing to an end with a record 76-18 play-off defeat at Huddersfield.
Ellis, the former Leeds and Wakefield player, joined Hull on a three-year contract at the start of the year after ending a successful four-year stint in the NRL with Wests Tigers.
He missed the first three months of the season with a foot injury sustained in the warm-up ahead of the opening game but recovered in time to play for England in the mid-season match against the Exiles and captained Hull to the Challenge Cup final in August.
"We made it to Wembley this year which was a great achievement, but I want to be there again next year and the year after," Ellis added.
"I want to be able to play my part for the club week in and week out and make a contribution to help us achieve things, and I feel the best way for me to do that now is to retire from international rugby.
"Steve (McNamara) was very understanding when I spoke to him regarding my decision and I would like to wish him and the team the very best of luck ahead of the upcoming tournament.
"I will certainly be supporting the boys from the stands and I hope to see as many Hull FC fans there getting behind England throughout the tournament."
McNamara, who will announce his 24-man squad next Tuesday, said: "Gareth has made a massive contribution to England, both on and off the field, where his attitude was never anything other than totally professional.
"The standards of his performances with Wests Tigers demonstrated that England players are among the best in the world and though he has had a difficult season with injury I have no doubts that he has lots to offer Hull FC in the years to come.
"We fully understand the reasons behind his decision and wish him all the very best for the future."
Ellis is the most high-profile England player to announce his retirement from the international game since Jamie Peacock stepped down 18 months ago, and he has since enjoyed a new lease of life with Leeds.