After going unselected in the 2015 NFL draft, Roberts signed with the Denver Broncos on May 3, 2015.[1] He was waived for final roster cuts before the start of the 2015 season, but signed with the Broncos' practice squad on September 7.[2]
On February 7, 2016, Roberts was part of the Broncos team that won Super Bowl 50. In the game, the Broncos defeated the Carolina Panthers by a score of 24–10.[3]
On August 30, 2016, Roberts was waived by the Broncos.[4]