247 Sports reporter Wes Rucker confirmed rumors that Harris tore his anterior cruciate ligament at Monday's practice.
The redshirt freshman had been competing for playing time in an already-thin middle of the linebacking corps for the Vols. He had impressed coaches after a year in the weight room.
If there was a place UT couldn't afford an injury, this was probably it, especially with Herman Lathers still not close to 100 percent. This will open up the possibility of converted fullback Channing Fugate getting in the mix at MLB. Harris will miss the season, most likely.