TMZ Sports has obtained video of the victim moments after he was struck in the face by an assailant at Clutch Bar in Dallas.
The person who shot the video tells us the man was involved in a verbal altercation with a woman who was in Ezekiel Elliott's party ... when Ezekiel got involved.
The witness says she saw Ezekiel punch the man -- corroborating the story the victim's friend told police.
However, cops at the scene could not confirm Zeke was the attacker and he has not been arrested or charged with a crime.
We spoke with the NFL -- and we're told the league is now looking into the matter to "understand the facts."
Per Adam Schefter, Elliott is already "bracing" for a short suspension (1-2 games?) for another incident. We'll see how this story develops over the next few days. If there is a complaint filed against Elliott or if charges are brought, the NFL will be sure to investigate.