Leeds forward Weller Hauraki has been ruled out for up to three weeks with a calf strain.
Hauraki, 27, picked up the injury in Sunday's 44-16 win over Widnes, although the positive news for him and the Rhinos is that he hasn't suffered a tear.
The Kiwi, who signed from Crusaders at the end of the 2010 season, has already begun rehabilitation with the Rhinos medical team.
He missed just three Super League games for the Rhinos last season, and was an ever present for Crusaders in 2010, scoring 11 tries.
St Helens chairman Eamonn McManus says the game is being undermined by inconsistent officiating and disciplinary.
Leeds legend Kevin Sinfield has revealed that 2015 will be his last season at the Rhinos, and that he will be playing rugby union for Leeds Carnegie in 2016.
With four matches under the Friday night lights, Round 7's tip is a 9/2 treble.
Coventry Bears will play their first League One game of the season on Good Friday against Oxford at Butts Park Arena.
Castleford Tigers, along with their charitable arm, the Tiger Trust,have confirmed that they have established a new association with the Five Towns wheelchair rugby league team.