ST HELENS centre Mark Percival insists the Super League leaders will not underestimate the challenge posed by injury-hit Leeds at Headingley tonight.

The defending champions have nine regulars missing through injury, including scrum-half Richie Myler who loses his ever-present record after being concussed in the home loss to Huddersfield.

That was a fourth straight league defeat and it leaves Leeds struggling to make the top four.