NEW signing Ashley Gibson is expected to make his Bulls debut in Sunday's Kingstone Press Championship derby clash at Halifax.

Having sealed his move from Wakefield yesterday, the centre has been named in Geoff Toovey's 19-man squad for the encounter.

Fellow new signing Damian Sironen doesn't arrive in the UK, from Australia, until Monday and misses the Round 21 battle.

However, young gun Reiss Butterworth is called up to the squad, with recalled Rhinos half back Jordan Lilley unavailable.

BULLS: Bentley, Butterworth, C. Smith, Caro, Chamberlain, Chapelhow, Davies, Gibson, Halafihi, Hallas, Keyes, Kirk, Magrin, Mendeika, Oledzki, Peltier, Roche, Ryan, Thomas.