1. Preheat oven to 400°F.
2. Combine meatballs, Alfredo sauce and pesto in large bowl. Toss to coat.
3. Slice loaves in half horizontally. Top each bottom half with 3 meatballs.
4. Top each meatball sandwich with one half-slice of Provolone cheese.
5. Place meatball sandwiches and top halves of bread on a baking sheet. Bake for 3 to 4 minutes or until cheese melts. Place top halves of bread on meatball sandwiches and serve immediately.