Head coach Dave Doeren did not give a specific reason for the suspension, only disclosing that the incident took place six months ago.
ESPN's Brett McMurphy reports that the suspension is the result of a failed drug test.
This is not the first time Thornton has been in hot water. He missed the 2013 season opener due to a suspension following an arrest for misdemeanor assault of a woman. He received another suspension in December 2013 after a citation for misdemeanor marijuana possession. He was reinstated to the team after the charges were dropped.
Thornton has led the team in rushing yards each of the past three seasons. Thornton rushed for 907 yards in 2014 and was named first-team All-ACC this preseason.
- Xandria James