Put chicken meat in a food processor and pulse a few times to roughly chop. Continue pulsing for about 30 seconds until the chicken is finely chopped. *If you turn "on" the food processor, your chicken will become a "paste" instead, use the pulse method until it's very finely chopped.
In a bowl, combine lemon juice, mayonnaise, salt, pepper creole seasoning and blend well.
Toss chicken into the bowl, combine a few times with a spatula and add finely chopped celery.
Top both tortillas with ½ to ¾ cup chicken salad and shredded lettuce. Fold and roll tightly. Cut in half and serve or pack into lunch containers.