MIX oil and flour in large saucepan. Cook on medium heat 6 to 8 min. or until browned, stirring constantly.
ADD green pepper, celery and garlic; cook and stir 4 min. or until tender. Stir in salsa and tomato sauce; simmer 10 min., stirring occasionally.
STIR in shrimp; cook an additional 6 to 8 min. or until shrimp are cooked through. Serve over rice.