Ange Postecoglou remained defiant as Nottingham Forest fans called for him to be sacked after barely three weeks in charge.
A damaging 3-2 Europa League defeat by Midtjylland means Postecoglou is winless in his opening six games in charge of Forest.
He has become the first permanent Forest manager for 100 years to fail to win any of his first six matches.
After Valdemar Byskov scored the visitors' late third goal at the City Ground, many Forest supporters chanted "You're getting sacked in the morning" towards the former Tottenham boss.
It was just over four months ago when Postecoglou was lifting this competition's trophy with Spurs, but he was dismissed 16 days later, paying the price for a dire domestic campaign. Now he is struggling to get results right at another club.
The first European game at the City Ground for 29 years ended in crushing disappointment, and the finger of blame was pointed at Postecoglou before the final whistle had blown.
Rubbing it in, fans then sang in praise of Postecoglou's predecessor Nuno Espirito Santo, who is now with West Ham.
Nuno guided Forest to seventh place in the Premier League last season before being sacked as his relationship with owner Evangelos Marinakis broke down.
Defeat to Midtjylland came after Saturday's 1-0 home loss to Sunderland in the Premier League.
These results have changed the mood at Forest, with supporters also turning to question Marinakis.