Thomas (knee) was participating fully in training camp Wednesday, Tyler Reed of Sports Illustrated reports.
Thomas missed his entire rookie year with a knee injury, but he is now healthy and competing for reps at left tackle with Tyler Guyton (knee) out 4-to-6 weeks. The Louisiana native has impressed so far, standing his ground in drills against some of the Cowboys' top pass rushers such as Marshawn Kneeland and Donovan Ezeiruaku.