Albion will face Espanyol in their final friendly of the summer.
Under Villarreal chief Unai Emery, Pervis Estupinan established himself as one of the top left-backs in LaLiga last season.
Celtic right-back Josip Juranovic is in no hurry to leave Parkhead, but Atletico Madrid want the defender now.
Real Madrid begin the defence of their LaLiga crown on the road against Almeria, while Barcelona face Rayo Vallecano.