Former Manchester United captain Roy Keane tore into Ole Gunnar Solskjaer's side after a dismal display in their 1-0 defeat to Arsenal at Old Trafford.
It was the Norwegian's 100th game at the wheel and comes days after their shock 5-0 thrashing of RB Leipzig in the Champions League, but Keane was having none of it.
"A huge disappointment.," Keane said on Sky Sports when asked for his initial response to Sunday's loss to Mikel Arteta's side.
"People were thinking United turned a corner...I was never kidded on by that. No energy. No enthusiasm. You make it a long day for yourself."
The Irishman continued: "Where do you want me to start? A lack of energy, of enthusiasm, and a real lack of quality. That really concerned me. No quality, no composure."
The Gunners' visit was the third match of the week at Old Trafford and this fixture was shaping up to be more like United’s 0-0 draw with Chelsea than the midweek win over Bundesliga outfit Leipzig.
The visitors opened the scoring in the 69th minute after Pogba made a penalty-box challenge on Bellerin that was as clumsy as it was needless.
Referee Mike Dean pointed to the spot and Aubameyang coolly sent De Gea the wrong way from the spot as Arsenal held on for their first Premier League win at Old Trafford in 14 years.