Caldwell told reporters Monday the team would not have kept Sanders on the active roster unless the Colts thought he would return sooner than the six-week window required if he opened the season on the physically unable to perform list. Sanders had offseason knee surgery and has not yet practiced.

The Colts did make a roster move Monday, adding veteran safety Aaron Francisco, who was cut by Arizona. The Colts then released linebacker Jordan Senn.

Caldwell said Francisco, a four-year NFL veteran, could play Sunday.