[Kansas City.com] Coach Todd Haley said that, despite a breakout 2009 season and a strong performance in Friday’s preseason opener, running back Jamaal Charles’ role is “still to be determined.”

Veteran Thomas Jones remains listed as the No. 1 running back ahead of Charles, a third-year back who rushed for 1,120 yards last season.

“Jamaal is a developing player,” Haley said Monday. “Jamaal is a player that, last year at times in that development, had good days, bad days and in-between days like a lot of other guys. That is part of the development, and that is part of becoming a dependable player on a daily basis.”

Haley said Charles has had a strong camp, even though he was unable to work out or practice during much of the offseason because of shoulder surgery.