Super League champions Leeds have been refused permission to loan veteran Samoan prop Kylie Leuluai to neighbours Hunslet.
The Rhinos have a partnership with the Hawks in which players not required for Super League duty can be dual-registered to turn out for the Championship club.
Leeds wanted Leuluai and fellow front rower Richard Moore to gain match practice with Hunslet against Leigh on Sunday. However, the Rugby Football League say they have been told by the UK Border Agency that, under the terms of his visa, Leuluai is unable to become a dual-registered player.
"The RFL has recently lobbied the UKBA for a change to the rules which prevent players on tier-two visas playing for a second club on a short-term arrangement.
"This follows on from changes to the Super League Academy structure, which from 2013 is an exclusively Under-19s competition, an arrangement that means open-age overseas tier-two visa players returning from injury cannot gain match fitness on short-term loans or dual registrations.
– A League spokesman
"Dialogue with the UKBA continues but the UKBA have confirmed that, until any change in circumstance is agreed, under existing provisions no player on a tier two visa can be dual registered."