Sean Russell has been sidelined indefinitely with fractured ribs and a punctured lung.
Russell has spent the night in hospital after suffering the injuries while scoring his third try in yesterday's win over the Gold Coast Titans.
The Club will be monitoring Sean over the following week to assess his recovery schedule.
At this stage, the Club is unsure when he will return but will provide an update when his prognosis is clearer.
The Eels' winger left the field in the 33rd minute after his impressive first-half hat-trick.