In a large pot, add chicken broth and barley. Bring to a boil, reduce heat, cover and simmer for 15 minutes.
In the meantime, in a microwave-safe bowl add the garlic, carrots, celery, and onions. Cook for about 2 minutes until vegetables are slightly softened.
Add vegetables and garlic to broth. Cook uncovered for 30 minutes.
Stir in thyme, sage and a little pepper. Continue to cook uncovered for 25 minutes.
Stir in cooked turkey and cook 5 minutes longer.