They may again need to do likewise before the opening match of round 24 between St George Illawarra and Penrith on Thursday.
Guerra summed up the general mood at the judiciary when he spoke after his not guilty verdict was handed down.
"The fact that I was here was a bit of joke in the first place," he said
"When I got told I was coming I honestly thought they were joking. The fact that common sense prevailed I am happy.
"They (the NRL) are up against it, but certainly as seen by the evidence they have got it wrong this week.
"That is the good thing about having the judiciary (panel) of ex-players there and that definitely worked in the footballers' favour tonight."
Luke will still sit out Souths' round 24 match with Canterbury on Friday after he took the early guilty plea on a dangerous throw against the Cowboys.
Blake Ferguson was also found not guilty of a tripping charge at the NRL judiciary on Wednesday night.
-AAP