2:35 PM PT -- Nick Piazza -- the NFL official who went down with an injury following the collision with Alvin Kamara -- suffered a dislocated knee as well as a fractured fibula.
But, thankfully, his blood vessels remained intact, according to New Orleans Saints writer John DeShazier.
DeShazier added that surgery for Piazza is likely to happen next week.
An NFL official had to be taken off the field on Sunday on a stretcher ... after he suffered a gruesome leg injury following a sideline collision with Alvin Kamara.