After going unsigned throughout the 2017 NFL season, free agent Colin Kaepernick was scheduled to work out for the Seattle Seahawks this week, but that trip has reportedly been postponed by team officials because the controversial quarterback would not promise to stand for the national anthem throughout the upcoming season.

According to the report by ESPN, the Seahawks are still considering trying Kaepernick out, but they have not made any decision on the matter.

Kaepernick’s trip to Seattle had been planned for several weeks, according to the report, but was abandoned by team officials after the former San Francisco 49er refused the Seahawks’ last-minute request that he promise to stand for the national anthem.

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Eric Reid (left) and Colin Kaepernick kneel in protest during the anthem before a game in 2016

In 69 games with the San Francisco 49ers, Kaepernick was 28-30 and had thrown for 12,271 yards, completing 59 percent of his passes and tossing 72 touchdowns and 30 interceptions

Kaepernick has been a free agent since March of 2017, following a 2016 NFL season in which he created significant controversy as a member of the San Francisco 49ers by protesting inequality and police brutality against minorities by kneeling and sitting during the national anthem.

The 30-year-old has a pending lawsuit alleging collusion by the league office, owners and teams to keep him out of the NFL. He was deposed by the NFL's lawyers in that lawsuit on Tuesday.

According to Kaepernick's lawsuit, '[The owners] have colluded to deprive Mr. Kaepernick of employment rights in retaliation for Mr. Kaepernick's leadership and advocacy for equality and social justice and his bringing awareness to peculiar institutions still undermining racial equality in the United States.'

After filing the lawsuit, Kaepernick said on Twitter that he had done so 'only after pursuing every possible avenue with all NFL teams and their executives'.

Kaepernick began his pregame protest following excessive force cases involving police. He first sat during the anthem in the 2016 season and then knelt. He was quickly joined by his San Francisco 49ers teammate Eric Reid before players on other teams followed suit.

One player who has continued protesting is no-former Seahawks defensive end Michael Bennett, who was released after the season and has signed with the Super Bowl champion Philadelphia Eagles.

Head Coach Pete Carroll of the Seattle Seahawks speaks with team owner Paul Allen before the game against the Indianapolis Colts at CenturyLink Field on October 1, 2017

Several influential NFL players have argued that Kaepernick deserves to be in the NFL after leading the 49ers to three NFC Championship Games and one Super Bowl.

Both New England Patriots quarterback Tom Brady and Green Bay Packers quarterback Aaron Rodgers have said they believe he should be on a roster, with Rodgers going so far as to tell ESPN he thinks the Wisconsin native is being blackballed.

'I think he should be on a roster right now,' Rodgers said. 'I think because of his protests, he's not.'

Now-former Seahawks star Michael Bennett refused to stand for the national anthem in 2017 and was subsequently released

In 69 games (58 starts), all with the San Francisco 49ers, Kaepernick was 28-30 and had thrown for 12,271 yards, completing 59 percent of his passes and tossing 72 touchdowns and 30 interceptions.

Kaepernick, who hasn't played since January 1, 2017, also has 2,300 career rushing yards and 13 touchdowns on the ground.

He hasn't had a workout with any NFL teams since becoming a free agent.

Kaepernick met with Seattle during free-agency last offseason, but the team opted instead to sign Austin Davis to back up Russell Wilson. Davis, who was on a one-year deal, is now a free agent and the team also recently released Trevone Boykin, leaving them with zero options behind Wilson at the moment.

Three NFL owners are on the deposition list for Kaepernick's lawsuit: Jerry Jones of the Dallas Cowboys, Robert Kraft of the New England Patriots and Bob McNair of the Houston Texans.

McNair was infamously quoted in an ESPN report as suggesting the league should crack down on protests because 'we can't have the inmates running the prison.'

Head coaches John Harbaugh of the Ravens and the team's general manager, Ozzie Newsome, are also on the request list from Kaepernick's attorneys. The same goes for the Seahawks' braintrust of coach Pete Carroll and GM John Schneider and NFL executives Troy Vincent and Arthur McAfee.

Reid continued to kneel during the anthem in 2017 after Kaepernick left the 49ers

Eric Reid made the Pro Bowl as a rookie in 2013 (left) and remains one of the NFL's best safeties

Earlier this week, the Cincinnati Bengals reportedly hesitated to sign Reid, another free agent, because he too would not promise to stand for the anthem in 2018.

The former Pro Bowler safety previously said he is not planning on protesting in 2018. However, when pressed on the subject by Bengals owner Mike Brown during an interview on Monday, Reid stopped short of promising to stand for the anthem throughout the upcoming season, according to Pro Football Talk.

The Bengals coaches were reportedly interested in signing Reid, a former first-round pick who was an All-American at LSU, but Brown supposedly plans on prohibiting players from protesting in 2018, which is reportedly why the Bengals passed.

After Reid met with Brown he reportedly took a physical and went over film with coaches, who he believed to be interested in signing him. Later, however, head coach Marvin Lewis asked Reid to clarify his answer on protesting, but Reid declined and left without an offer from the Bengals.

Reid previously wrote on Twitter that his activism was affecting his search for a new team.