Kelly was appointed in January and has taken control of just two training sessions so far, but those are enough for Celek to be excited about how the coach communicates from play to play.
"From a communications standpoint, it's going to change the league," Celek told Philly Mag. "I'm not going to tell you guys how, but it will.
"Just the way that they can communicate plays in and get us the stuff, it's pretty cool. It's something that I never even thought was possible in the NFL.
"Seeing the stuff he's doing, he has a reason why he does everything that he does, and a reason why each play is called what it is. It all makes sense. I can't say that we're going to be super successful, but from a communications standpoint, it's insane. I think it's awesome."
Celek has 3,473 receiving yards in his career at an average of 12.4.