As reported in today’s edition of The Yorkshire Post, England seamer Plunkett, 33, is in the last year of his contract at Headingley.
Yorkshire’s director of cricket Martyn Moxon said: “We are trying to assemble a squad that has availability and is within our budget to compete in all three domestic competitions.
“With that in mind, we are not in a position to be able to offer Liam a new contract.
“He has played a big part in our recent success, and we obviously thank him for that and wish him well for the future.”
In 2017, the fast bowler claimed 36 one-day international wickets in the calendar year, the joint second-best haul in the world behind Afghanistan leg-spinner Rashid Khan (45).
Last season, saw him play only 10 times across all three forms for Yorkshire, with injury ruling him out for large parts as well as the regular international commitments.
“It’s disappointing that it has come to an end but it is incredibly exciting that I’ve got a chance to go to another really big club and hopefully win some more silverware with them,” Plunkett told yorkshireccc.com. “It’s bitter-sweet but a new chapter.
“Obviously, Yorkshire took a chance on me after Durham and I appreciate everything they’ve done for me. I feel as though I’ve played some of my best cricket at Yorkshire, including getting myself back in to the England team. It has been amazing to meet some good friends - some best friends. I think some of the cricket we played, when we won some stuff, was some of the best I’ve been part of as a team unit.
“There comes a time in people’s careers where you don’t get offered a contract. Obviously, Yorkshire want to go in a different direction. I feel like I’ve met some really good people, made some fond memories and won some good trophies for an incredibly passionate club.”