Pogba played nonetheless but he clearly didn't look anywhere his best, ambling through the game and hardly ever producing a decisive touch, and was hooked off for Michael Carrick soon after his failure to compete at a set-piece allowed Newcastle to score.
Mourinho spoke with MUTV immediately after the game where he noted that the home side fought like animals.
In the space of 90 minutes Newcastle go from the bottom three to 13th in the table as they claim their biggest biggest success of the season, and their first since New Year's Day.
Newcastle appeared to be fighting a rearguard action when they took the lead to lift the roof off St James' Park.
Conceding United could have no complaints about the result, Mourinho said: "My verdict is that we could've been here for 10 hours and not scored a goal".
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If people say that I have not had enough success it is their opinion, but I can say that I had a lot of success at the club". I don't have anything to prove to anyone. "He told me all was done and of course it was a big factor in coming here".
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As I write these notes I am still not sure whether they will be able today, but if they do play, hopefully they can show us what the can bring to the team and provided a boost for everyone.
Alexis Sanchez delayed his shot in front of an open goal and saw his effort blocked, while Martial also had two efforts blocked near the goal line by Dwight Gayle. I think now it's the third time it's happened this season. I think it's the nature of the game that the more you fear the more you target. Were Newcastle lucky? Yes, they were. Failing to win their last eight matches at St. James', this is the second worst Premier League run in Newcastle's Premier League history.
"He has super individual ability - there is much to admire about his technique when he is on the ball and his general athleticism", Souness said of the player who joined United for a then-world-record £93.25m fee. You have to work like they did today, it was an wonderful effort. By yourself you make your own analysis.
I know that Newcastle players, fans and [Rafael] Benitez are very happy with the three points, with the feeling that the gods of football were with them, so at least I have that little smile.
'Salah has surprised me, I didn't think he'd get anywhere near the goals he's got. "He's not a left back, he's not a striker, so when people say what's his best position for Paul to play - Paul is a midfield player".