Colin Kaepernick, the quarterback who for nearly three years has struggled to resume his N.F.L. career after kneeling during the national anthem to protest racial injustice, has been invited to work out for teams on Saturday at the Atlanta Falcons’ facility so they can evaluate whether to sign him, according to a copy of a memo to the league’s 32 teams that was reviewed by The New York Times.

“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,” the memo said. “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 N.F.L. career.”

Kaepernick, 32, and his representatives were notified Tuesday of the league’s invitation and were told they had two hours to confirm that he would attend the workout in Flowery Branch, Ga., according to a person familiar with the discussion who requested anonymity. The person said that the representatives were confused about why the workout was slated for a Saturday, when teams travel to away games, and that they had asked for it be moved to a Tuesday, when teams usually hold their workouts, but that request was denied by the league.