The 31-year-old chose to sit for the National Anthem on Saturday night during Oakland's exhibition contest against Arizona.
Lynch sat out during a contentious 2016 NFL season, which saw a number of players taking a knee during the National Anthem.
Lynch's apparent protest comes in wake of this weekend's violent white nationalist rallies in Charlottesville, Va. and falls in line with what Colin Kaepernick started around the National Football League last season as players found ways to protest racism and police brutality during the playing of the anthem before games.
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People on social media, on the other hand, had plenty to say both for and against the move. The situation escalated and resulted in one person's death and 19 injured after a vehicle driven by an angry member of a white nationalist groupplowed over another group of counter-protestors.
Raiders head coach Jack Del Rio was unaware of Lynch sitting during the national anthem, but accepted his decision.
"On Marshawn, talked to Marshawn trying to make sure we're on the same page", Del Rio said, according to the NFL Network.
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"[Lynch] said, 'This is something I've done for 11 years".
In his first game back since he retired following the 2015 season, Lynch was dressed in uniform but did not play. "I told him I very strongly believe in standing for the national anthem".
"If you're really not racist then you won't see what he done, what he's doing, as a threat to America, but just addressing a problem that we have", Lynch said at the time. But I respect him as a man and he can do his thing. "We'll do ours.' It's a non-issue for me".
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