India, July 23 -- The NFL training camp has already started, which means it won't be long before fans get to see their favorite players compete on the field as well. However, certain key players may be visibly missing in action due to injuries sustained by them as a result of the previous season or this offseason. Four such key players, namely cornerbacks Trevon Diggs and Josh Butler, along with linebacker DeMarvion Overshown from the Dallas Cowboys, have been placed in the PUP (Physically Unable to Perform) list this season. Rookie cornerback Shavon Revel, on the other hand, has been put on the non-football injury list.

All four players whose future or playing in the regular season with the Cowboys remains uncertain as of the moment hav...