The Red Devils slipped out of the top four due to the 2-0 defeat at Arsenal yesterday as the race to qualify for the Champions League looks set to go to the wire.
After his clanger in the first half, David De Gea kept a low profile as he headed through the station just before 11pm with his team-mates.
The Spanish goalkeeper – so usually
However, interim boss Solskjaer was unwilling to blame his stopper.
The Norwegian said: “I don’t class it as a mistake by De Gea.”
“I was stood right behind the ball and we don’t put enough pressure on Xhaka, who must be Brazilian by the way.
“He’s struck the ball from outside the area and it serves and moves. It goes to David’s left and changes direction completely.
“David is disappointed every time he concedes a goal but he’s been absolutely fantastic for us.”
The United defender was at the centre of another pitch invasion storm as an Arsenal fan ran on to the field and pushed him following Pierre-Emerick Aubameyang’s penalty.
Fred – given a rare start for the Red Devils – also had a day to forget after striking the post from distance and then bundling Alexandre Lacazette to the ground for the spot-kick.
But Solskjaer was unconvinced by Jon Moss’ decision.
He added: “I don’t think it’s a penalty and the referee will be disappointed when he sees it again.