Over the weekend, several NFL players headed to Las Vegas for the Pro Football Arm Wrestling Championship. That decision is going to cost them. 

According to a report from NFL Network, the players that were involved will be fined by the NFL. 

NFL rules prohibit players from appearing at casinos for any sort of promotional purpose (even not relating to the casino). “Had we been asked in advance if this was acceptable, we would have indicated that it was in direct violation of the gambling policy,” Joe Lockhart, the NFL’s executive vice president for communications and public affairs, said of the players’ decision to attend the event, per USA Today. “No one sought pre-approval.”

Among the players expected to be fined are Steelers linebacker James Harrison, Steelers center Maurkice Pouncey, Dolphins wideout Kenny Stills, 49ers linebacker No’Vorro Bowman, Raiders punter Marquette King, Raiders defensive lineman Mario Edwards, Patriots safety Patrick Chung, and (possibly) former Seahawks running back Marshawn Lynch, who has been rumored in recent weeks to be on the verge of an NFL return.