Ange Postecoglou's Nottingham Forest were greeted with resounding jeers following their 1-0 home defeat to Sunderland on Saturday.
Forest remain without a victory since Postecoglou took over from Nuno Espirito Santo as manager on September 9. The Reds have suffered three defeats and managed two draws across their five matches since the former Tottenham Hotspurmanager's arrival at the City Ground.
It represents a stark contrast to the outstanding season under Nuno last term, when the East Midlands outfit secured seventh place to clinch European qualification for the first time in nearly three decades.
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However, the Portuguese was dismissed merely three games into the new season following a dispute regarding the club's transfer strategy under former Arsenal Sporting Director Edu.
Nuno has since returned to management, replacing Graham Potter at West Ham United on Saturday.
Meanwhile, Postecoglou has endured a difficult start as he attempts to satisfy the high expectations of ambitious owner Evangelos Marinakis.
Forest currently occupy 16th position in the Premier League standings and faced hostile reception from supporters after Omar Alderete's first-half strike secured maximum points for the Black Cats.
"It was one of those evenings where we should have got the outcome we wanted," Postecoglou told BBC Sport post-match.
"We have enough chances to win the game. We conceded a really poor goal, albeit from a poor decision from the official, but after that, we had enough chances to win the game.
"We are in a cycle at the moment where we are getting every outcome out of the game except the win, and that is the most important thing."
On why his side are not scoring, he added: "It's hard to say but we don't really have the luxury of time to analyse that.
"We have the foundation to win games of football but we are not and we need to change that. Fans have got every right to be disappointed, they want to see their team win.
"I understand their disappointment, certainly shared by us in the dressing room and by me and my job is to rectify that."
Forest's focus will now shift to their Europa League encounter against Danish outfit Midtjylland at the City Ground on Thursday, before travelling to face Newcastle United in the Premier League next Sunday.
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