A Twitter user posted a NSFW video of Penn in a verbal exchange with a fan, later identified as Sal Chavarria (h/t TMZ Sports), after Penn left his car. A security guard and a metal barrier separated the fans from the players' exit.
Penn, 34, returned to his vehicle on his own accord and left the stadium without the situation escalating further.
Carmichael Dave of KHTK later shared an image of a NSFW Instagram conversation between the fan and Penn in which the lineman challenged the fan to "say it to my face."
Penn alleged that the fan planned the encounter with the goal of getting money from him after a potential physical altercation:
Charvarria later spoke to TMZ, denying he threw a water bottle at Penn, adding "several witnesses" support that claim, including security, and denying Penn's claim he was looking to obtain money from the incident.
Chavarria also said he's open to settling his differences with Penn.
The Raiders dropped to 2-3 after their offense struggled in its first full outing without quarterback Derek Carr. Backup EJ Manuel took three sacks and was hit five times on 26 attempts, throwing for a paltry 159 yards.
Penn, Oakland's starting left tackle, was a subject of fan scorn following a brief contract holdout in training camp. The Raiders signed him to a two-year, $21 million extension in September.