United looked on track for a valuable three points away from home thanks to Juan Mata's brace, which included a sublime free-kick on the hour, and Daniel Amartey's red card with 17 minutes remaining.
More relevant to the futures of some of his fringe players, the performance means they will not be considered when Mourinho focuses on the more urgent matter of trying to cut into Manchester City's 11-point lead at the top of the table.
Mourinho stormed: "We didn't win because we missed incredible chances. Easy decisions to make in easy transitions to counter attack".
Jamie Vardy of Leicester City celebrates scoring the opening goal with his team. Lingering around the edge of his own penalty area, Vardy pounced on a clearance and laid the ball into the path of Wilfred Ndidi, whose first-time pass sailed over the United defence and into the path of the onrushing Mahrez.
Lingard should have made it three when he hit the post after rounding Schmeichel, while the Dane also got his fingertips to the ball to stop substitute Marcus Rashford when he was through on goal.
United manager Jose Mourinho was left cursing "childish" errors at both ends of the pitch.
United were woeful in the first half, and not much better in the second half.
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"I don't get United", said ex-England winger Chris Waddle.
The report adds that he would be prepared to go in January - in the hope of more game time ahead of the World Cup - and that he's already been approached with an offer from China. "Manchester City buy full backs for the price of strikers".
After United took the lead they were fortunate not to fall further behind, but showed character to come back and equalise.
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.
"We got a point but it feels like a defeat because we were so close to winning, had chances to kill the game and they were with one less player".
Their revival under Puel leaves them in eighth at Christmas, but with only two defeats in his 10 league games in charge.