To add to the manager's damning appraisal of the defeat, Mourinho also said some of his players did not even want to "come to the office" as Bristol pulled off one of the season's major cup surprises. We get a point but it feels like a defeat because we were so close to winning and we had a chance to kill the game.
Mourinho made eight changes from the side that lost to Bristol City, with Paul Pogba returning from suspension to captain the team, while Victor Lindelof, making his fifth Premier League start, went to right-back in place of the injured Antonio Valencia.
"But that's football, you know, and in the last second they put the ball into the box and they scored. It was not about the dribbling and hit the bar, it was not just about the cases with an open goal, it was easy decisions to make to counter-attack".
Wilfred Ndidi sprayed a 60-yard pass to Riyad Mahrez, who only had Smalling and De Gea for company.
Lindelof blocked Christian Fuchs' goalbound effort after the break, while Martial missed a one-on-one with Kasper Schmeichel, blasting over from 12 yards.
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Steven Defour would score a masterful free-kick late in the first-half to compound United's misery and somehow, the Clarets hung on to their 2-0 lead till the interval. It seems harsh to ask after he suffered such a serious question, and when he has only played a handful of games since his return, but given his age, it has to be done.
The England global was dropped from the starting line-up in the wake of the 2-2 draw with Leicester City last week but came off the bench to snatch a point for his side at Old Trafford on Tuesday.
After United took the lead they were fortunate not to fall further behind, but showed character to come back and equalise.
"But we need to keep going and think about the next game - obviously with the will of finishing the game with a much better feeling". Although the Red Devils are touted as favourites going into the game, let us not forget that Jose Mourinho's side are now facing a slump of sorts. It's fantastic for the future.
United's players looked ashen-faced as they traipsed onto the bus at Leicester, where they were on course for a comeback win after Mata's first top-flight brace since March 2015 cancelled out Jamie Vardy's opener.