Frank Kosman will be responsible, in part, for helping Kelly decide when to throw a challenge flag or not. Last season, the Eagles were 3-of-7 on challenges, which was 17th in the NFL.
Kosman takes the job over from offensive coordinator Pat Shurmur, who previously was the one to aid Kelly.
The Eagles threw one challenge flag in Sunday's season opener against the Jaguars, a challenge they lost.
Philadelphia plays the Indianapolis Colts in Week 2 on Monday Night Football.
- Molly Geary