In a bowl, combine the turkey, half the pesto, Parmesan cheese, garlic and salt. Shape into 4 patties. Brush ciabatta rolls with olive oil; set aside.
Grill patties for 10-13 minutes or until cooked through, flipping halfway. Top each patty with Mozzarella slices. Cover grill and cook until cheese melts. Add bread to grill to toast.