1.Combine chicken in medium bowl with tomato, basil, egg white, breadcrumbs and half the garlic; shape mixture into 2 burgers.
2.Cook burgers on heated oiled grill plate (or grill or barbecue) about 20 minutes or until cooked.
3.Cook pancetta on grill plate until crisp. Drain.
4.Toast cut sides of focaccia on grill plate.
5.Combine mayonnaise with remaining garlic, spread on focaccia bases; sandwich rocket, burgers, pancetta and cheese between rolls.