Campbell was given permission to explore a trade after Donovan McNabb was acquired from Philadelphia last week. Campbell couldn't find a team that would make a suitable offer to him as a restricted free agent, so he signed the tender Monday.
The move puts the onus back on the Redskins to find a trade partner for Campbell. Their best chance might come during next week's draft.
Campbell has stopped attending voluntary workouts at Redskins Park and is not expected to attend this weekend's three-day minicamp.