The Colts could be without safety Bob Sanders when they open up the regular season on Sept. 13. Sanders remains on the PUP list after undergoing surgery on his right knee, and coach Bill Caldwell isn't sure when he'll be able to play. "I'm not certain," Caldwell said. "I would say that if I felt that way. The most important thing is to get him healthy." Indianapolis owner Bill Polian provided a little more insight. "He's coming back during the regular season, and probably for the vast majority of it. The question is how fast is he progressing over the next four weeks, and it looks pretty good right now."