Tom Grant will take charge of Leeds Rhinos’ visit to Hull FC on Saturday afternoon. The same day, Jack Smith is the man in the middle for Castleford Tigers’ match at Warrington Wolves. Sunday’s game between Wakefield Trinity and St Helens will be refereed by Marcus Griffiths. This weekend’s other appointments (all on Friday) are: Wigan Warriors v Salford Red Devils – Chris Kendall; Hull KR v Catalans Dragons – Ben Thaler; Leigh Leopards v Huddersfield Giants – Liam Moore.