NFL clubs were informed Tuesday that a private workout will be held for free-agent quarterback Colin Kaepernick on Saturday in Atlanta, according to a copy of a memo obtained by ESPN.

The session will include on-the-field work and an interview. All teams are invited to attend, and video of the workout and the interview will be made available to them.

Several clubs had inquired about Kaepernick's current football readiness. Sources told ESPN's Dan Graziano that the workout was also set up in response to an Oct. 10 statement by Kaepernick's representatives, who said they had received "little to no response" from the 32 NFL teams. Kaepernick has been out of the NFL since 2016, the year he began protesting police brutality and racial injustice by kneeling during the pregame national anthem.

In the memo, the league said: "Earlier this year, we discussed some possible steps with his representatives and they recently emphasized his level of preparation and that he is ready to work out for clubs and be interviewed by them. We have therefore arranged this opportunity for him to work out, and for all clubs to have the opportunity to evaluate his current readiness and level of interest in resuming his NFL career."

Kaepernick tweeted about the workout Tuesday night:

I'm just getting word from my representatives that the NFL league office reached out to them about a workout in Atlanta on Saturday. I've been in shape and ready for this for 3 years, can't wait to see the head coaches and GMs on Saturday. — Colin Kaepernick (@Kaepernick7) November 13, 2019

As Kaepernick suggested in the tweet, the proposed workout on Saturday came as a surprise to the quarterback and his representatives.

Sources told ESPN that Kaepernick and his reps were alerted to the workout at 10 a.m. Tuesday, ahead of a 4 p.m. ET personnel notice that was sent to teams. When notified, the quarterback's reps asked for the workout to be on a Tuesday, which typically is when NFL workouts take place because head coaches and general managers can more easily attend. On Saturday, almost half of the NFL teams will be traveling to games, and most of the rest of the coaches and players will be heading to their team hotels to prepare for their games the next day.

But the NFL said the workout had to be on a Saturday, sources told ESPN. When the league was asked whether it could be on the following Saturday -- by making it this Saturday, the 32 teams have only about three days to make a decision on whether to attend and whom to send -- the NFL said no and didn't provide a reason.

Sources told ESPN that the league office also said none of the 32 teams had been made aware of the workout before the memo was sent. When Kaepernick's representatives asked whether a team or teams had asked for the workout, the NFL league office said, "We can't tell you that," the reps explained

Because of the shroud of mystery around the workout and because none of the teams had been informed before Tuesday, Kaepernick's representatives began to question the legitimacy of the workout and the process and wonder whether it was just a public relations stunt by the league, sources told ESPN. The representatives asked the league office for a list of personnel executives and coaches who would be attending the workout because GMs and head coaches make personnel decisions, especially given how important the quarterback position is.

As it stands now, the ball is in the NFL's court to submit the list of personnel executives and coaches who will attend on Saturday.

One source from an NFC team told ESPN's Josina Anderson that the team would review on Wednesday morning whether to attend the Kaepernick workout. "We have nothing to lose by attending Kaepernick's workout, but I still think for us it would just be an information-gathering trip," the source said.

A source told ESPN's Ed Werder that the Dallas Cowboys will send at least one representative to the workout. Regarding the timing of the workout, one general manager told Werder that the Saturday date was problematic with his team set to play Sunday.

Miami Dolphins coach Brian Flores told reporters Wednesday that his team will have a representative at the workout. He said that he likes his team's quarterback situation but that the organization will do its due diligence. Detroit Lions coach Matt Patricia said Wednesday that a representative from his team would be in attendance, and Atlanta Falcons coach Dan Quinn said he is sure his team will have someone at Kaepernick's workout, which is being held at the team's facility. The Washington Redskins also will be represented, a team spokesman said.

Sources told Graziano that the workout, in addition to being held at the Falcons' facility, will be administered by the president of National Football Scouting, Jeff Foster, whose responsibilities include deciding which prospects are selected for the NFL draft combine and administering the combine.

The workout, which will be closed to the media, will be conducted by former NFL coaches, although the exact names have not been finalized.

Kaepernick, who turned 32 on Nov. 3, opted out of his contract with the San Francisco 49ers in March 2017 after the season in which he began his protests.

Within the past two years, Kaepernick and former Niners teammate Eric Reid filed grievances against the league through the NFL Players Association, alleging collusion among team owners to deny jobs to both players. In February, it was announced that both players had reached a settlement with the NFL. Terms were not disclosed.

Reid, a safety, is in his second season with the Carolina Panthers.

Last month, Kaepernick's representatives said that he has been "working out five days a week, for three years, in preparation to play again" but that the opportunity hasn't presented itself.

ESPN's Cameron Wolfe, Michael Rothstein and Vaughn McClure contributed to this report.