Chicken Salad Panini Sandwiches

Name: Chicken Salad Panini Sandwiches
Ingredients: ¼ cup light mayonnaise; 1 tablespoon balsamic vinegar; 2 cloves garlic, minced; 1 ½ cups cooked chicken breast, chopped; ⅓ cup fennel, finely chopped; 8 slices very thinly sliced whole wheat bread; ¾ cup arugula or spinach leaves; ¾ cup bottled roasted red peppers, drained and cut into thin strips; 4 slices reduced-fat provolone cheese (3 ounces total); 1 Olive oil or nonstick cooking spray