Niko Kovac was unimpressed with Bayern Munich's lack of energy despite the Bundesliga champions thumping Mainz 6-1.
Jean-Paul Boetius silenced the Allianz Arena on Saturday with the opening goal in the sixth minute.
New arrivals Philippe Coutinho and Ivan Perisic were handed their first starts and the Croatia international set up Benjamin Pavard for the equaliser half an hour after Mainz's opener.
David Alaba's stunner put Bayern in front, then Perisic scored a header before Kingsley Coman, Robert Lewandowski and substitute Alphonso Davies secured an ultimately emphatic victory.