The Scout three-star defensive tackle's commitment is a result of a late push by Tennessee to solidify its defensive line in the 2014 class after losing four-star defensive tackle Davonte Lambert to Auburn on JUCO signing day.
With the Vols losing its entire starting defensive line because of graduation, the 6-foot-3, 280-pounder marks the eighth defensive linemen in the 2014 class, including three four-stars and four three-stars.
Robertson's commitment also serves as yet another example of the Tennessee coaching staff's success at in-state recruiting.
The Montgomery Bell (Tenn.) Academy standout makes the ninth in-state prospect to pledge to Tennessee – or the 12th if including the 2015 class.
Robertson has been a starting player for MBA since his freshman year and has achieved All-Region honors twice.
This season, Robertson logged 74 tackles, 14 tackles for loss, four sacks and five pass break ups. He lists his bench press max at 395 pounds.
In 2013, MBA lost to Memphis University School in the TSSAA Division II Class AA semifinals to cap a 10-2 season.
Robertson picked up a late offer from Penn State and newly-named head coach James Franklin.