Calderwood was holding out for better terms on his Leeds deal

The 23-year-old, who has scored 91 tries in 118 appearances for the Rhinos, will leave at the end of the season when his current deal runs out.

"Being a Leeds lad, I have been very proud of playing for my home-town club" he said.

"But I believe in my ability and value as a player. It has been a major decision to turn down the offer."

Calderwood, whose form this year earned him a place in the initial Great Britain squad, was offered a new deal five weeks ago but had been holding out for better terms.

"Whatever the future holds from 2006 onwards, I can promise the Rhinos supporters that I will continue to give 110% on and off the field for the rest of the season as we chase Challenge Cup and Grand Final honours," he added.

Our job now is to find a replacement Rhinos chief executive Gary Hetherington

The London-born winger, who has won England A honours, is certain to find a new club and seems unlikely to switch codes to rugby union.

Wasps were at one time interested in the player but recently ruled themselves out of a move.

Rhinos chief executive Gary Hetherington said: "It's disappointing because Mark has been a member of a group of young players who will hopefully be together for many years to come.

"We are surprised at his decision but we respect his wish and he will leave at the end of the season with everyone's best wishes.

"We are now in an age of freedom of contract and our job now is to find a replacement. With this in mind we hope to make an announcement in the near future."