Bradford back-row forward Elliott Whitehead has shocked the Bulls by handing in a transfer request.
The 23-year-old Bradford-born player, an ever-present this season, has been dropped for Sunday's game at St Helens after telling coach Francis Cummins that he wants to play for a bigger club.
Cummins said: "His agent, Andy Clarke, rang me last Friday and told me that Elliott wanted to leave because he didn't feel the progress of the club was what it should be and that he wanted to test himself at a top-four club.
"I kept it professional and decided he would play at Hull KR last Sunday and I then sat down with Elliott first thing on Monday morning. Elliott again reiterated what his agent had said.
“I asked him if there is anything else I or the club could have done better and he answered 'no'. He is now on leave until the situation is resolved. I can't have players in my squad who don't want to be here."
The Bulls will demand a fee for a player who agreed a long-term deal last year and is under contract until the end of 2016.
Whitehead, who made his Super League debut in 2009, is valued by Bradford in excess of £100,000.
Catalan Dragons are understood to have shown an interest but are not willing to pay a fee for his services while Salford City Reds, coached by former Bradford boss Brian Noble and backed by multi-millionaire owner Marwan Koukash, are thought to be keen.