A white Porsche registered to ex-NFL star Lance Briggs crashed into a bartending school in Chicago early Wednesday morning ... TMZ Sports has learned.

The Chicago PD confirmed the 5:40 AM accident ... but would not say if Briggs was the driver.

The license plate on the car is registered to Briggs.

You can see in the pictures, the car smashed into the front of the school -- shattering the glass door.

We're told Briggs has not been arrested and no warrant has been issued for his arrest.

Cops say they are investigating the incident.