Nebraska linebacker Randy Gregory is a projected top five pick in this year's 2015 NFL Draft.

In this exclusive workout video, Gregory weighted 243 pounds (up from 235 at the Combine), lifted 26 reps on the bench (24 at the Combine) and a 4.56 in the 40 (4.64 at Combine).

It was reported on Thursday morning that Gregory failed his drug test at the Combine.

"I blame myself," Gregory told Sports Illustrated. "I don't want my career to be defined by the fact that I had failed a drug test or anything of that sort."