TMZ Sports has obtained an image of Mark Sanchez being placed into an ambulance after Saturday's stabbing incident in Indianapolis ... showing him lying shirtless and wounded on a gurney as he received medical attention.
We've obtained video and pictures from the scene around 12:30 AM ... showing a large police presence in the area.
In the footage, the alleged victim -- a 69-year-old delivery driver -- can be seen sitting upright with a towel covering his face .