Chicken, Squash and Pasta Soup

2 medium stalks celery, coarsely chopped (1 cup)

1 medium onion, coarsely chopped (1/2 cup)

1 teaspoon dried sage leaves

6 cups Progresso® chicken broth (from two 32-oz cartons)

2 1/2 cups chopped deli rotisserie chicken (from 2- to 2 1/2-lb chicken)

1 1/2 cups uncooked tricolor rotini pasta (about 5 oz)

1 1/2 cups 3/4-inch cubes peeled butternut squash

1/4 teaspoon salt

1/8 teaspoon pepper