It's do or die for Cronulla's Lisa Fiaola team when they face Wests Tigers at Leichhardt Oval on Saturday morning with a preliminary final berth on the line.

After stirring wins against the Warriors, the Jersey Flegg Sharks and Newtown Jets will tackle the Knights as part of a pulsating Easter Sunday triple-header at McDonald Jones Stadium.

Sharks coach Craig Fitzgibbon has named an unchanged team for this week's Easter Sunday showdown with the Knights in Newcastle.