Four Bulls players have today been named in the Great Britain shadow squad for the one-off Test against Australia on Friday, July 12.
They are utility back Leon Pryce, scrum half Paul Deacon, hooker James Lowes and loose forward Mike Forshaw.
Great Britain head coach David Waite has also announced Wigan pair Gary Connolly and Stephen Wild, Hull's Richard Horne and Garreth Carvell, Danny Orr and Lee Harland of Castleford, Warrington duo Lee Briers and Nick Fozzard and St Helens' John Stankevitch.
All 19 players in the original squad will undergo medicals after Thursday's Super League fixtures to see if any of the stand-by squad are needed.
Pryce, Forshaw and Deacon were all involved in the three-match Ashes Series in Great Britain last November, but Lowes missed out because of injury.
The Great Britain squad fly out on Friday for the match at Sydney Football Stadium.
Meanwhile, the Bulls dismissed claims they have snapped up New Zealand Warriors' wing or centre Shontayne Hape.
Reports claimed Hape, out with a knee injury since the NRL's opening weekend, had signed a two-year deal.
Bulls spokesman Stuart Duffy said: "These sort of stories are always coming out from the other side of the world, but it's pure speculation."
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