Slayton isn't participating Wednesday in the first practice of training camp due to an undisclosed issue, Jordan Raanan of ESPN.com reports.
The rookie fifth-round pick reportedly is walking gingerly while he watches practice from the sideline. Once he gets healthy, Slayton may have an opportunity to compete with Corey Coleman, Cody Latimer, Russell Shepard and Bennie Fowler for the No. 3 receiver job.