Shannon McDonnell says he will do "everything humanly possible" to play for Hull in next month's Challenge Cup final against Wigan.
The Airlie Birds full-back pulled his hamstring when attempting to prevent Joel Monaghan scoring the opening try after six minutes of Sunday's semi-final win over Warrington.
McDonnell, who missed three matches with a similar injury in March, was forced to watch from the sidelines as Hull hung on for a tense 16-12 victory.
The 25-year-old Australian now faces an anxious wait to discover the extent of his latest setback and whether he can get back for the Wembley final against the Warriors on 24 August.
"I over-strode and it clicked," McDonnell said. "I'll do everything humanly possible to make myself in contention in four weeks.
"It depends on what grade it is - it can be a long one. We'll check it out and go from there.
"I'm desperate to play. It's bittersweet at the moment. To not play would be shattering, but it's fingers crossed."
Hull have yet to taste victory at Wembley. They were defeated by St Helens in their last appearance at Wembley in 2008 while their last Cup success in 2005 came at Cardiff's Millennium Stadium.
Hull coach Peter Gentle admitted his side's Cup run has been a contributing factor behind their slide down the Super League table but McDonnell hopes it can inspire a reversal in form against Widnes on Friday.
"We've got the team and we've got the game to win every game that we're in - it's just putting it together on the day," he said.
"We've shown that we can perform against any team - it's just consistency which is missing."
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