12:40 PM PT -- Kevin Colbert, General Manager of the Steelers, says the team has placed Porter on leave while they gather more information about his arrest.
TMZ Sports has obtained video of Pittsburgh Steelers assistant coach Joey Porter being arrested after he allegedly roughed up a bouncer Sunday night ... and he's jawing at cops during the incident.
As we previously reported, an off-duty officer says Porter got into it with a bouncer at The Flats bar after he was denied entry. The officer says the ex-NFL linebacker grabbed the bouncer and lifted him off the ground.
The officer says an allegedly drunk Porter then grabbed him by the wrist in a threatening manner ... and began to yell at him that he did nothing wrong. Porter was eventually arrested after the officer called for backup.
In the footage, you can see a heated Porter in cuffs. It's unclear exactly what he's saying to the officers.
Sources at the bar tell us Porter was at the bar with at least 2 Steelers players ... who were screaming they would never come back to that bar.