SEATTLE -- Sidney Jones, a potential first-round draft pick, injured his left leg during defensive back drills in pro-day workouts at the University of Washington on Saturday.

The Washington cornerback was taken to a local hospital, where the injury was being evaluated, a source told ESPN's Adam Caplan.

Jones was performing one of his final drills of the session when he quickly pulled up and went down to the turf at the Dempsey Indoor Center.

As he was starting to make a break out of his backpedal, Jones immediately began favoring his left leg and tumbled to the ground. Jones began to grab at the underside of his leg after coming to a stop.

He was helped to his feet by fellow defensive back Budda Baker and to the sideline by Washington head coach Chris Petersen.

After a brief conversation on the sideline, Jones hopped on the back of a cart and was taken out of the building.

"It's really tough, just because Sidney is one of our best friends," Baker said. "He's a great prospect coming out. Felt like he could have been the first corner, and still can be the first corner, off the draft board. The last drill, last thing you've got to go, and that happens. So, definitely sad, but we know Sidney's strong, and he's going to still be there."

ESPN's Mel Kiper projected Jones as the No. 16 pick in his most recent mock draft, which was released before the combine. Jones also is listed as the No. 13 overall prospect in Todd McShay's latest Top 32 this week.

Jones elected to turn pro after his junior season at Washington. In three years, Jones was twice honored as a first-team All-Pac 12 conference selection.

Jones was the top cornerback for a Washington defense that led the Pac-12 with just 17.7 points per game allowed. He finished his Washington career with 145 tackles, eight interceptions and six forced fumbles in 40 games.

The Associated Press contributed to this report.