Sports Illustrated’s Albert Breer reports CB Will Johnson has a knee issue that’s been “flagged” by teams.

“It shouldn’t affect him in the short term, but teams are concerned it could impact his longevity. Add to the questions on Johnson’s long speed, which were not allayed when he decided not to run a 40, and the Wolverine star could slide,” Breer writes. A staple of the top-fives in way-too-soon mock drafts all of last summer and fall, Johnson’s speed and medical flags could have him slipping into the back half of the first round. Or further.