Philadelphia cornerback Lito Sheppard skipped the team's voluntary workout on Tuesday amid frustration with his contract, according to The Associated Press. Sheppard, a two-time Pro Bowler, had his status placed in doubt when the team signed free-agent corner Asante Samuel several months ago. Sheppard attended the mandatory post-draft minicamp in May and split time in workouts with Samuel and Sheldon Brown. At the time, he said he was hopeful the situation could be resolved.