Willie McGinest beat the hell out of a man at an L.A. hotspot earlier this month ... punching the guy in the face and later bashing him in the head with a bottle -- shocking new video, obtained by TMZ Sports, shows.
The wild altercation went down on Dec. 9 at Delilah in West Hollywood ... when the ex-NFL star and several of his apparent acquaintances could be seen in the footage unloading on a man who was sitting at a table at the popular lounge.
In the clip, you can see McGinest walking up to the guy and appearing to exchange words with him -- before landing a left hook straight to his face.