Wests Tigers prop Bryce Gibbs is to risk an extended three week NRL suspension by challenging the grading of his dangerous contact charge.

But if Gibbs is successful at a hearing on Wednesday evening he will be free to continue playing in 10th-placed Wests Tigers' desperate bid for a finals berth over the remaining two rounds.

Gibbs was charged with grade two dangerous contact after catching Parramatta's Luke Burt in the back with his knee as the winger scored a try during the Tigers' 26-18 defeat last Friday.

He pleaded guilty on Tuesday but is contesting the grading which would have given him a two match ban if he'd forgone a hearing.

He will get three weeks out if he's unsuccessful but escape a ban if he can get it reduced to a grade one offence.

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