United kick off the Premier League season at home to Leicester City on Friday and Mourinho took the opportunity at his pre-match news conference to take a swipe at both the perceived negative coverage of his tenure and praise given to unnamed counterparts who fail to lift major honours.
"We changed Daley Blind [returned to Ajax] for a 19-year-old kid [Dalot] that we believe has the potential to play right-back or left-back".
Leicester City reportedly wanted close to £75m and, despite Mourinho's protests, the Man United chiefs elected to pass.
It is understood United officials have grown increasingly tired and suspicious of Pogba's high-profile agent Mino Raiola, whom they blame for stories that his client would prefer to play for Barcelona.
"[Fred] is a midfield player, he's not a striker, not a central defender". He worked amazingly well on Monday, Tuesday and Wednesday.
'If they feel they can help us [against Leicester on Friday], if it's 20 minutes, 10 minutes, half an hour.
"I want to say a nice word, we were unlucky to get the Friday match as we could get the Sunday", he bemoaned at opening the campaign.
Another player who has come through an uncertain summer with United is Anthony Martial, who was left out of his France's World Cup squad, prompting comments from his agent that he wished to leave Old Trafford to safeguard his worldwide future.
"In pre-season it looked like I was saying something absolutely out of order, it looked like I was saying something insane", he added.
Mourinho was left irritated by the lack of signings, says the Guardian, as his bosses believed the targets were no better than the players he already had.
He added: "There are ways to improve your team: one way is to spend a lot of money and to bring in lots of important players, another way is to work and that's the way we have to do it". So, when you repeat 1,000 times that my relationship with my players is not good, it's a lie that repeated 1,000 times is still a lie.