With the Leafs not set to play until Tuesday night, this gives the Department of Player Safety time to investigate the incident and draw their conclusion. According to an earlier report from Chris Johnston, the league is treating this incident very seriously and gathering as much information as possible. At this time, the hearing date and time hasn't been announced.
It was an especially violent cross check, that came at a brutal time after a goal and with only seconds remaining in the game. Still, Greig's slap shot was clearly a cocky and showboat move, and it warranted a response from the Leafs. Still, the Department of Player Safety won't care about the context, and will likely throw the book at Rielly.