According to the L.A. Times, it took 3 days for authorities in Inglewood to acknowledge the incident even took place ... and Thursday, officials were met with skepticism over why they didn't tell the public sooner.

40-year-old restaurant owner Daniel Luna is believed to be the man who was the victim of the heinous assault, according to the report.

Police Lt. Geoffrey Meeks said Los Angeles County Fire Dept. paramedics found Luna wearing a Niners jersey 30 minutes after the game started ... but it's unclear when the attack actually happened.

Of course, the timing is inauspicious for Los Angeles County -- the area is set to host Super Bowl LVI in the coming weeks -- which leads many to believe that authorities weren't as quick to release information surrounding the event out of fear of a PR nightmare.

Law enforcement sources tell TMZ Sports no suspects have been identified in the case ... but police launched an investigation into the matter sometime around 7 PM Sunday night, according to the report.

Officials at SoFi Stadium did, however, say they were "aware and saddened by the incident," and they were working with law enforcement officials throughout the course of their investigation.

"Our thoughts are with Mr. Luna’s friends and family during this difficult time."