Barnsley will visit League Two Accrington Stanley on July 20 in a pre-season game.
The friendly will be a testimonial for long-serving Stanley player Sean McConville.
The Reds return to pre-season training on July 1 and are expected to play a series of friendlies between mid-July and early August.
The new League One season begins on August 9-11, with the fixtures set to be released on June 26.