The NFL sent a memo Tuesday to its 32 teams, saying that the session will include fieldwork and interview time with the former San Francisco 49ers quarterback, ESPN first reported.
The training will take place at an unopened location in Atlanta, a source with direct knowledge of the event has told CNN. Clubs that do not participate personally have access to video from the session. The event will be closed to the media.
Kaepernick tweeted about developments on Tuesday night.
"I just got to notify my representatives that the NFL League Office reached out to them about a workout in Atlanta on Saturday," he tweeted. "I've been in shape and ready for this for 3 years, can't wait to meet the head coaches and GMs on Saturday."