Polak isn't listed on the Stars' Phase 3 training camp roster, Stephen Whyno of the Associated Press reports.
Polak (personal) returned to practice Friday, NHL.com's Josh Clark reports.
Polak won't travel with the team to Nashville for Thursday's game against the Predators due to a personal matter, Sean Shapiro of The Athletic reports.
Polak has no points in his last 22 games.
Polak has been a healthy scratch in two of the last three games.
Polak has no points in his last 13 games.
Polak recorded an assist and two hits in Sunday's 5-1 loss to the Flames.
Polak managed an assist, three hits and two blocked shots in Thursday's 4-3 overtime win over the Lightning.
Polak posted five blocked shots, four hits and two shots on goal in Friday's 3-2 overtime loss to the Golden Knights.
Polak notched an assist, two shots on goal, three blocked shots and two hits in Friday's 3-1 loss to the Blues.