Preheat oven to 375ºF. Line a cookie sheet or baking pan with parchment paper.
Mix together chopped chicken, diced celery, Worcestershire sauce, salt, pepper, mayonnaise, and onion powder.
Separate crescent rolls into triangles. Cut each triangle in half to form two triangles.
Place ¼ slice of cheese on top of the crescent roll, top with a tablespoon scoop of chicken salad, and roll up the crescent roll.
Place rolls on cookie sheet. Sprinkle with poppy seeds. Repeat with remaining crescent rolls.
Bake for 18 to 20 minutes, or until golden brown.