Roy Keane singled out Marcus Rashford for criticism after Manchester United were deservedly beaten by Arsenal on Sunday night.
Pierre-Emerick Aubameyang fired the Gunners to their first victory at United since 2006 as Ole Gunnar Solskjaer's 100th match at the wheel ended in disappointment.
October started for the Red Devils with a 6-1 thrashing at home to Tottenham and November kicked off with another loss as the Gunners ended their 13-match wait for a league win at Old Trafford.
Aubameyang put away the second-half penalty needlessly given away by Paul Pogba as Mikel Arteta's Arsenal secured a deserved 1-0 victory against a United side who thrashed RB Leipzig during the week.
United legend Keane was livid after the game and told Sky Sports: "I looked at Rashford closely today. He's had loads of plaudits over the last few months and I know he's a young man.
"His body language was shocking. Shrugging his shoulders when things didn't go his way? You roll your sleeves up when you play for Manchester United.
"When things aren't going your way, that's when you look at your leaders. I don't see any leaders out there. Right through the whole team, from the experienced players."
It was quite the comedown from United's Champions League demolition, with defeat in Solskjaer's 100th match in charge meaning they have failed to win in their opening four home league games for the first time since 1972-73.
Keane added: "Where do you want me to start? We spoke before the game about being on the front foot.
"You want to be aggressive, you're the home team. Their home form has been poor obviously.
Get the latest transfer news straight into your inbox!
Want to be on the ball with all of the latest football news?
Well then sign up for the brilliant new Daily Star Sport email newsletter!
From the latest transfer news to the agenda-setting stories, get it all in your email inbox.
How do you sign up?
It only takes a matter of seconds.
Simply type your email address into the box at the top of this article and hit 'subscribe'.
And that's it, job done. You'll receive an email with all of the top news stories every single morning.
You can find out more information on our email newsletter on this link here.
"There was none of those things. A lack of energy, of enthusiasm, and a real lack of quality. That really concerned me in the second half. When they were getting in half decent positions. They were obviously chasing the match. But there was no quality, no composure.
"Some of the performances were really, really poor. Ole will be scratching his head. We keep speaking about after the Spurs game, have they turned a corner? It's the longest corner ever. I am just not convinced by these players.
"We all talk about characters at Manchester United. I don't see enough of them today."