In a sandwich maker, slightly toast the bread pieces.
Heat olive oil in a pan and turn heat to medium.
Grill turkey for a couple of minutes then add mozzarella. Grill until slightly melted.
Spread 2 tablespoons pesto over both sides of French bread and top with mozzarella, turkey, cucumbers, avocado and top half of bread. Repeat with remaining slices of bread.
Stick in the sandwich maker again and leave until bread is golden.