Erik ten Hag accused Manchester United's players of "sleeping" in their disastrous start against Cadiz.
United were 2-0 down after 13 minutes through goals from Carlos Garcia and Anthony Lozano before Anthony Martial converted a penalty before half-time.
Ten Hag replaced all 10 outfield starters at half-time and Kobbie Mainoo equalised quickly but Cadiz eventually ran out 4-2 winners.
