Jose Mourinho believes his players may be struggling under the pressure as Manchester United continue to suffer an alarming drop in form, and singled out Luke Shaw for criticism following yesterday's defeat at Watford.
The Red Devils had not lost to the Hornets in 30 years but were deservedly beaten 3-1 at Vicarage Road, adding to derby defeat at home to Manchester City last weekend and Thursday night's Europa League loss away to Feyenoord.
United were not at the races for much of the afternoon as Mourinho, who has now tasted defeat in three successive games for the first time in over a decade and for the first time in a single season in England, opted to play a 4-3-3 formation with captain Wayne Rooney again uninspiring in a deeper midfield role.
Paul Pogba is still yet to justify his world record £89m fee, although he did see a 25-yard effort crash against the crossbar, and Mourinho, who questioned Shaw's positioning for the second goal, admits his side still need to improve after their good start to the season came shuddering to a halt.
"I feel that some individuals probably feel the pressure and responsibility too much," he said.
"But from a collective point of view, I only have good things to say about them. At 1-1 everyone thinks we are going to win the game. We were showing complete control, intensity, creation.
"But their second goal is a mistake that goes against our plan and our training, because our intention was for their wing-backs to be pressed.
"And what happened was the guy gets the ball 20-25 metres away from our box and instead of being pressed, we give him the space to progress. (Nordin) Amrabat receives the ball and our left-back (Shaw) is 25 metres from him instead of five.
"But even at 25 you have to jump and go and press, but no, we wait. This is a tactical but also a mental attitude. It's something that doesn't become perfect in a couple of weeks. So we have to improve, no doubt, individually and collectively. And that's my job.
"We started the season very well with (winning) the Community Shield and three victories in a row in the Premier League. But was I thinking that my team were unbeatable? Not at all.
"I was completely aware that we were not perfect, with lots of players who are not end products and can make mistakes."
The first Watford goal came as Anthony Martial was caught in possession on the edge of his own box, moments after needing treatment following a clash of heads.
Mourinho could not confirm whether the France international had suffered a concussion despite being replaced by Ashley Young, disappearing with a limp which appeared to come from the challenge from Miguel Britos which led to the goal.
But referee Michael Oliver was also blasted by Mourinho for not giving a free-kick for the challenge on Martial in the build-up to Etienne Capoue's goal.
Asked if he felt the tackle of Martial was a foul, the Portuguese replied: "When you come with that question it's because you know. You don't ask me about that if you think that nothing happened. The reason you asked the question is my answer.
"The referee's crucial mistakes are not in my control. We were punished by these mistakes and I can't do anything about it."