Heat olive oil in a large skillet over medium high heat. Add the celery, onion, bell pepper, garlic, and sausage. Cook until the vegetables begin to soften.
Stir in the tomato sauce, diced tomatoes, chicken stock, and 1 cup of water. Add 2 to 3 tablespoons of Cajun seasoning based on your personal preference.
Bring the mixture to a boil. Mix in the pasta. Cover and lower heat to medium-low.
Simmer 10 to 15 minutes until the pasta is al dente. Add additional water as needed.