All eyes will be on Chip Kelly’s Philadelphia Eagles when they open training camp Saturday. This comes after Kelly overhauled the roster in the offseason, becoming just the fifth returning coach since 1970 to change his No. 1 quarterback, leading rusher and leading receiver from the prior season.

Quarterback Nick Foles was traded to the St. Louis Rams for Sam Bradford, who had reconstructive knee surgery in each of the two previous seasons. All-pro running back LeSean McCoy was shipped to the Buffalo Bills and replaced with...