New Zealand Warriors great Manu Vatuvei has not played since 2017 and revealed on Wednesday he has a cyst in his brain.
Salford Red Devils eased past Wakefield Trinity at home in Super League on Sunday thanks to Niall Evalds' hat-trick.
Tuimoala Lolohea scored the only try of the game in testing conditions as Leeds Rhinos moved four points clear of London Broncos.
Seven tries from seven different players saw St Helens beat Castleford Tigers and restore their six-point lead at the top of Super League.
Salford Red Devils have confirmed former player Jansin Turgut is in hospital in Ibiza having reportedly sustained a head injury in a fall.
Salford Red Devils produced a fine comeback at St Helens, but there was another twist in the tale as the Super League leaders prevailed.
Warrington Wolves put the pressure on Super League leaders St Helens with a comfortable win at Castleford Tigers on Friday.
There was only one try in Wigan's game against Castleford, with Sam Powell's second-half score enough to earn the Warriors victory.
Super League leaders St Helens scored 11 tries in a brutal thrashing off Hull FC, whose city rivals were also giving a hammering.
Regan Grace scored a hat-trick of tries as St Helens moved four points clear in Super League thanks to victory over rivals Wigan Warriors.