Robertson, 6-1, 234, is a seven-year NFL veteran, who was originally signed to the Cleveland Browns practice squad near the end of the 2011 season out of North Texas. After playing for the Browns from 2012-15, the Stafford, Texas native has played for New Orleans the past three seasons. He has played in 105 career games with 64 starts, recording 532 tackles (359 solo), eight sacks, nine interceptions, 26 passes defensed, three forced fumbles, eight fumble recoveries, 42 special teams stops, one special teams fumble recovery and one blocked punt recovery.

Since signing with New Orleans as an unrestricted free agent in 2016, Robertson has been an asset on both defense and special teams for the past three seasons, serving as a team captain, the past two campaigns. He has played in 47 games with 27 starts, recording 218 tackles (158 solo), four sacks, three picks, 11 passes defensed, one forced fumble, three fumble recoveries, ten special teams stops, one coverage fumble recovery and one recovery of a blocked punt. In 2018, Robertson played in all 16 games and posted ten tackles (six solo) and one sack on defense, while his four special teams stops, include significant plays on the coverage units. On Sept. 23 at Atlanta, Robertson recovered a blocked punt. On Nov. 4 vs. the Los Angeles Rams, he stopped a fake field goal attempt. On Dec. 23, vs. Pittsburgh, he stopped a fake punt attempt short of the first down marker.