The 21-year-old has been tipped to be selected first overall by the Houston Texans, and experts believes that he has the talent to perform at a very high level in the professional game.
"Once I get to the NFL my career is going to go up," Clowney told reporters. "I want to be one of the best. I want to be one of the greatest of all time."
Clowney notched 24 sacks during his three years with South Carolina.