Gallen chose to fight a contary conduct charge imposed on him following a fight with Tigers forward John Skandalis during last weekend's game between the two clubs at Telstra Stadium.
Gallen, who is suffering from a shoulder injury, would not have played this weekend even if he did beat the charge. In fact, he is expected to be out of football for the next six weeks.
The judiciary found that Gallen instigated the fight with Skandalis and then continued it despite the referee's attempts to stop it.
Meanwhile, the Canberra Raiders are expected to appeal a breach notice handed to them by the NRL yesterday. The club was fined $2,000 after Clinton Schifcofske exceeded the allowable time when attempting to kick a goal against St George-Illawarra last Sunday.
Schifcofske exceeded the time limit by just five seconds, but the NRL say they need to adhere to the new rule strictly.
"Having set the rule for that very reason, we now have a duty to enforce it," NRL Chief Operating Officer Graham Annesley said.Like