Waterhouse out with knee injury

Warrington could be without back-rower Trent Waterhouse for three months due to a knee injury.

Waterhouse, 33, picked up the knock in the Magic Weekend win over St Helens, and saw a specialist last week where it was confirmed he has torn his medial ligament.

The former Australia international is now in his third season at the Halliwell Jones Stadium since arriving from Penrith at the end of 2011, missing just seven league games in that time.