He had 47 receptions for 835 yards and eight touchdowns and that turned into a five-year, $25 million extension.
The 26-year-old Cooper blossomed in Kelly’s offense and more production is expected this season.
"Riley got a lot better last year because he (utilized) his physical nature," wide receivers coach Bob Bicknell told CSNPhilly.com. "I think it's learning what you have, what you're special at and how to use that against whatever they're trying to do."
Cooper improved steadily as the season went on and he pulled in six catches for 68 yards in the playoff loss to the New Orleans Saints.
"I don't feel like it took him longer to get acclimated (to Kelly's offensive system)," Bicknell told CSNPhilly.com. "In some ways, I'm not sure how much Riley thought of himself as a starter in the National Football League. I don't think he had done that yet -- be a guy that was an everyday starter. I talked to him this year about how great and how good he thinks he can be. Any player has to gain that feel, and I think he's starting to do that. He'll get better and better with confidence."
The Eagles lost a deep threat when wide receiver DeSean Jackson was released in the offseason.
Bicknell believes that Cooper can fill that role.
"Deep threats are guys who catch the ball probably over 20 yards down the field," Bicknell said. "(After losing Jackson), I don't personally look at it and say, 'Gosh, we can't go deep.' I think Riley Cooper has some of the best ball judgment on deep balls as anybody."