Rangi Chase (picture) looks as though he will be wearing the black and white of Hull next season.
Castleford are close to agreeing the departure of their England half-back, who has also been linked with Wigan and Huddersfield.
New Zealand-born Chase is under contract to the Tigers until 2015 but is seeking a new challenge.
New Hull owner Adam Pearson has promised six new signings for next season but he will have to stump up a fee for Chase.
There were strong reports, as yet unconfirmed, that the Black and Whites had agree a four-year contract with Huddersfield’s Danny Brough.
Hull have room under the salary cap for Chase with Willie Manu, Jordan Turner, Mark O’Meley and Sam Moa all leaving at the end of the season.