COLIN Kaepernick is taking a stand.

The most polarising quarterback in the free agent pool is filing a grievance against the NFL owners for collusion, according to multiple reports.

Kaepernick is filing under the collective bargaining agreement, not through the Players Association, and has hired lawyer Mark Geragos, according to Bleacher Report, a lawyer who has represented high-profile clients such as Michael Jackson, Winona Ryder and NASCAR driver Jeremy Mayfield.

I am told that @Kaepernick7 has filed a grievance under the CBA for collusion against the owners. If accurate, this is huge. — mike freeman (@mikefreemanNFL) October 15, 2017

More: @Kaepernick7 is preparing statement about his filing of grievance against owners for collusion under CBA. It should be released soon. — mike freeman (@mikefreemanNFL) October 15, 2017

Kaepernick has hired attorney Mark Geragos. Who has represented numerous high profile clients. — mike freeman (@mikefreemanNFL) October 15, 2017

Kaepernick is both the face and originator of the national anthem movement, which he began last year to protest police brutality and the treatment of minorities in the United States. While spearheading the protest, he played effectively, if not spectacularly, with a poor 49ers team, with whom he threw 16 touchdowns and four interceptions in 12 games.

After the year he opted out of his contract and has received little interest and zero offers from the league, which has mostly been uncertain how to handle athletes taking a knee during “The Star-Spangled Banner.”

In a league in which retread quarterbacks are recycled every year, the silence around Kaepernick has been curious, with some maintaining he’s too controversial for their fan base to touch and others stating he’s not good enough.

An ABC report said the grievance claims owners “colluded to deprive Mr. Kaepernick of employment rights in retaliation for Mr. Kaepernick’s leadership and advocacy for equality and social justice.”

Giants co-owner John Mara said he got a flood of letters this off-season from fans pleading him to stay away from Kaepernick, though he denied the one-time rising star was being blackballed.

“Anybody that thinks that there’s been any conversations going on among teams about Colin Kaepernick is crazy,” Mara said on ESPN Radio in August. “That just is not the case. I saw a quote, I think it was (Dolphins owner) Steve Ross recently that said, ‘Teams want to win so badly that if they believe a player can help them win, they’re going to bring him on.’ I think there are certain issues obviously that go along with Colin Kaepernick and that may have scared some teams away, but there is absolutely no blackball going on here. I just don’t see that at all.”

At the time, Mara thought Kaepernick would find a job. It’s Week 6, and the player who brought San Francisco to the Super Bowl in 2013 is still unsigned, even as many quarterbacks have gone down.

Green Bay’s Aaron Rodgers is the latest QB to suffer an injury and could be out for the season after breaking his collarbone against the Minnesota Vikings on Sunday.

who do you think the packers are gonna pretend like is better than kaepernick — Shea Serrano (@SheaSerrano) October 15, 2017

Kaepernick should submit the tape of Bortles' performance today as part of his collusion lawsuit. — Bill Simmons (@BillSimmons) October 15, 2017

But commissioner Roger Goodell has denied the league has conspired against signing Kaepernick.

“I believe that if a football team feels that Colin Kaepernick, or any other player, is going to improve that team, they’re going to do it,” he said in June.

Kaepernick has completed nearly 60 percent of his career NFL passes for 12,271 yards and 72 touchdowns with 30 interceptions over 69 NFL games.