Sheffield Wednesday host La Liga side Villarreal on Saturday 28 July (3.00pm) in a pre-season friendly.
The summer warm-up clash takes place one week before the Owls head to Wigan for the Sky Bet Championship curtain-raiser on Saturday 4 August.
Tickets for the Hillsborough friendly are now on general sale.
The North and South Stands will be open for this fixture and prices are as follows;
Adults: £15
Under 11s: £10
Villarreal qualified for the group stages of the Europa League following their fifth-place finish in the Spanish top flight last season.
Tickets can be purchased in person at the Ticket Office, Sheffield Wednesday Online Shop or by telephone on 03700 201867 (option 1) (£2 booking fee per ticket).