Mourinho denied any falling out with Pogba when confirming the decision, but Sky Sports' footage from training the following morning suggested all is not well. "I am the manager I can make these decisions".
As revealed by ESPN FC, Mourinho told Pogba of his decision on Tuesday, just a day after the £89.3 million midfielder had spoken out to demand that United deploy more adventurous, attacking tactics at Old Trafford.
The France global said United should "attack, attack, attack" when playing at Old Trafford in a none too disguised criticism of Mourinho's approach.
"The person who made the decision to be second captain was also me".
The relationship between Jose Mourinho and Pogba has completely soured after the Manchester United boss stripped him of the club's vice-captaincy.
Pogba has frequently tested Mourinho's patience with post-game comments and the club are already eight points behind Liverpool in the Premier League.
"Mourinho's message to the United squad, delivered at Carrington today, was created to underline his authority and remind the players that he is in charge", added The Times report.
Bolton: US Will Be "Aggressive and Unwavering" On Iran Oil Sanctions
The European Union is creating a new payment mechanism to allow countries to legally trade with Iran amid U.S. sanctions. The United States pulled out of the Joint Comprehensive Plan of Action, better known as the Iran nuclear deal, in May.
He has scored four times in seven appearances and also set up Fred's opener against Wolves at the weekend.
Manchester United is sitting seventh in the Premier League standings with tensions running high between the embattled manager and his players.
Maybe, at 25, he still will but for the moment, it is far from clear if it will be him or Mourinho left standing at Old Trafford when the smoke from their conflagration clears.
"I think Jose has been patient, but I think his patience has run out now". That's my way of thinking - we should move better, we should move more, yeah.
While at Real Madrid he demoted Spain goalkeeper Iker Casillas to the anger of the club's fans and at Chelsea he did not see eye-to-eye with Juan Mata, whom he now manages at Old Trafford.
United were sent out of the championship by League one side Derby County who is now being managed by former Chelsea star Frank Lampard.
Mourinho needs to back his star player, and handing him the armband seemed like a positive step.