In whatever becomes of Von Miller's career as a Broncos linebacker, he always will be the first player selected in the NFL draft during John Elway's and John Fox's tenure.

Miller is coming off a season in which he finished with 18½ sacks, 28 tackles for loss and six forced fumbles. Fox said Tuesday at the league meetings he sees far more to come for Miller.

"It's not fair to say, but I'm just telling you, I know the sky is the limit," Fox said. "I think the reason he improved — physically, he's the same cat — (but) mentally, it's being able to key and diagnose things quicker."

Fox pointed to Miller's interception return for a touchdown against the Tampa Bay Buccaneers in December as the kind of play Miller made this past season that he likely would not have made as a rookie.

"He had a pick-six this year. He would haven't done that (as a rookie)," Fox said. "Those types of things—understanding coverages, understanding how offenses try to exploit him — all the things he's experienced, all of the sudden that great athletic ability is used even more."