Hull FC prop Garreth Carvell agreed a new three year contract at the club only to request a release from the new deal 24 hours later.
The Great Britain international signed on for the 2009, 2010 and 2011 seasons, but changed his mind and verbally requested he was released from his new contract. Hull subsequently received the request in writing.
Chief executive James Rule said: “Garreth Carvell signed a new three year contract for 2009, 2010 and 2011 with us.
“However, the following day he informed the club that he had a change of mind and wished to be released from that contract.
“This is a substantial contract that reflected the value of Garreth to the club. It also provided an opportunity for Garreth to play into his Testimonial year.
“We are surprised and disappointed by Garreth’s change of heart and both parties are now seeking to work out a viable solution to the situation.”
Head Coach Richard Agar added: “It is a massive disappointment for us.
“However, when talking of contracts of this magnitude I feel their has to be an element of players wanting to play for a club.
“Hopefully we will find a solution to the situation but in the meantime I have no doubts that Garreth will honour his present contract to the best of his ability.
“We have an important semi final coming up and I have no problem working with him.
“I know one of Garreth’s goals this season is to make the World Cup squad and I am therefore confident he will play to the best of his ability to make the squad.”