McDonald's is entering the chicken sandwich wars.

The chain is testing a Crispy Chicken Sandwich in Houston and Knoxville, Tennessee. The sandwich features a fried chicken filet served on a buttery potato roll, topped with butter and pickles. A deluxe version also includes tomatoes, lettuce and mayo.

The chain on Sunday teased the test, which will run from Dec. 2 through Jan. 26, according to a McDonald's spokesperson.

"Houston. Knoxville. Lunch tomorrow? No beef," the fast-food giant tweeted.

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McDonald's franchisees have asked for a Southern-style chicken sandwich as Chick-fil-A's threat to their business grows. The board of the National Owners Association, an independent franchisee group, wrote in an email in July that a chicken sandwich should be their top priority.