Lewis has been stood down by the club since last Friday when news broke of the alleged incident.
The halfback, who was told he would be released by the Dogs earlier this week, is now facing sanction.
According to Channel 9 reporter Danny Weidler, Lewis will have to apply to have any future contract registered with the NRL.
He is also facing a fine in the region of $10,000.
Earlier in the week Weidler revealed that Lewis donned a mask and put a hood over his head as he attempted to steal the speaker.