Stuff each chop with 1 slice of mozzarella and 1/4 of the prosciutto and sage chiffonade and secure with toothpicks and place in a medium shallow baking dish.
Whisk together the garlic, olive oil and vinegar and pour over the veal chops. Cover and let marinate in the refrigerator for 2 hours.
Preheat grill. Remove chops from marinade and season with salt and pepper to taste. Grill the chops for 7 to 8 minutes on each side for medium doneness.