Cowboys' Charles Tapper: Suffers concussion

Tapper suffered a concussion during Tuesday's practice, Drew Davison of the Fort Worth Star-Telegram reports.

Concussions can carry volatile return timetables, so it's unknown how long Tapper will be sidelined with the head injury. Even if he makes a quick recovery, Tapper seems likely to sit out a good deal of what remains of the Cowboys' offseason program.