That was followed up by a tragic loss to West Ham United by three goals to one.
"I don't think [Luke] Shaw is a Man United player".
'Apart from Marcos Rojo, now we have Ander Herrera, Ashley Young and Jesse Lingard out, ' Mourinho told MUTV ahead of United's encounter with Valencia.
"When you play a long time with another team and you play different football in that other team you have some kind of adaptation that you have to have", said the Frenchman.
"That's not good enough. You see some people on the outside look like they haven't lost a game, but in training they are working hard".
But the Serbian star believes the United players are still giving everything to help Mourinho despite the current crisis engulfing the club.
"From the first minute, you could see we weren't winning the second balls and our duels".
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Left-back Shaw apologised to supporters for United's "awful" performance and said the players need to take a hard look at themselves while midfielder Juan Mata said he understood fans' frustrations. "That shouldn't be happening", he added. It was very poor from us.
But Shaw, whose past issues with his manager have been well-publicised, claims that Mourinho isn't exclusively to blame for the team's shortcomings.
"We have to do our job and we did it excellently, and that is why we deserved to win", he said.
Staff at Old Trafford are increasingly convinced it is a case of when, not if, Mourinho is sacked and it is thought Zinedine Zidane, who is a free agent after leaving Real Madrid in May, believes he could be offered the job if the Portuguese goes.
In addition to the problems on the pitch, Mourinho confirmed last week that Paul Pogba would not captain the side again after he had implicitly criticised the manager by urging the team to attack more. "So I would like to think it bodes for a good game".
"That didn't happen. It's disappointing and a very, very bad day for us". "He said: "We players on the pitch have to perform, we have to give more" and I like that perspective, but it's not the whole story".
Luke Shaw stepping up with Roy Keane (circa 2005) comments.