Derby's Harry Wilson, on loan from the Red Devils' arch-rivals Liverpool, canceled that out just before the hour before Jack Marriott scored what looked to have been an upset victor until the Belgian pulled the late goal back deep into injury time.
"Every team that play Manchester United are playing the game of their lives, and we need to match that level of aggression, motivation and desire - 95% isn't enough when others give 101%".
But the Special One has since confirmed he is no longer the vice-captain.
"The players were happy with that decision and the reasons behind the manager's decision", the source added.
On Monday, Pogba tried to downplay the issues with Mourinho, tweeting: "Some people make polemic even from "good morning" to create drama".
Following Saturday's 1-1 draw, Pogba said he wanted the team to be able to "attack, attack, attack" at Old Trafford.
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"I get it, I do get it and I'm sure it's something the players talk about in the dressing room".
All of this comes on the back of reported rifts within the United squad, with Mourinho's relationship with the likes of Paul Pogba, Anthony Martial and Luke Shaw all being questioned in recent months.
The 25-year-old was dispossessed in the move that led to Joao Moutinho's equaliser.
As for United, the malaise at Old Trafford shows no sign of abating.
If Lampard was a reminder of better days for Mourinho, the United manager was briefly lifted again thanks to Mata's third minute opener.
The United hierarchy are aware of the dispirited mood of numerous club's players, but there is a belief, and a hope, Mourinho can turn the situation around.
The France midfielder was rested for the clash and watched on from the stands.
But Harry Wilson equalized with a free kick in the 59th and United's problems deepened when goalkeeper Romero was sent off in the 67th for handling outside the box.