An NFL spokesman confirmed Sunday that the league has informed Allen and the Vikings that the All-Pro defensive end will be penalized and possibly fined if he performs his "calf roping" celebration after a sack. FOX Sports first reported the story.
The league prohibits players from going to the ground in celebrations. After sacks, Allen takes a knee, pretends to rope a calf and then throws his arms in the air. Allen presumably can still perform his celebration as long as he's standing on his feet.