Two varieties of Great Value frozen pizza sold at Walmart have been recalled over concerns of possible salmonella contamination, according to the U.S. Department of Agriculture’s Food Safety and Inspection Service.

The recall covers Great Value Stuffed Crust Chicken Bacon Ranch and Great Value Thin and Crispy Crust Chicken Bacon Ranch.

FSIS said the products are linked to a broader salmonella outbreak tied to meat and poultry items made with a previously recalled dry milk powder. As of Monday, the agency said no illnesses had been confirmed.

Customers who have the affected pizzas are advised to discard them or return them to Walmart for a refund.

The action expands an earlier recall that included Mama Cozzi’s Biscuit Crust Sausage and Cheese Breakfast Pizza and Mama Cozzi’s Cooked Pork Belly Crumbles, Cooked Bacon Topping, Pepper and Onion Breakfast Pizza, both sold at Aldi.