Quarterback Colin Kaepernick continues to undergo rehabilitation in Vail, Colorado, with no timetable set on being cleared for football activity, according to a source.

"He's definitely working hard," the source said.

Kaepernick underwent surgical procedures to repair a torn ligament in his right thumb and arthroscopic surgery on his left knee on Jan. 6 at the Steadman Clinic in Colorado.

Kaepernick was placed on injured reserve during the season, three days before undergoing surgery to repair a torn labrum in his left shoulder on Nov. 24.