Clayton is a naturalised Brazilian who will be playing in his second finals for Tunisia.
The only thing he managed of note in France 98 was picking up his country's first booking of the tournament for a foul on England's Darren Anderton.
Clayton has suffered from a rash of injuries in recent years and is now back in Tunisia after a spell in France with Bastia.
A rugged full-back, staying fit and out of the referees notebook will be his main concerns in Korea and Japan.