In large kettle, heat oil, add venison, and brown all sides. Remove meat with a slotted spoon and set aside. Add sausage, sliced, to kettle and brown on all sides. Drain off drippings. Add tomatoes (broken up with a spoon), water, onion, Worcestershire sauce, and browned venison. Heat to boiling. Reduce heat to simmer, cover and cook until almost tender - about 1 1/2 hours. Add cubed potatoes and sliced celery and simmer until vegetables and meat are tender, about 1 hour more.