Having strung together wins over Burnley, Watford and Young Boys, United seemed to be finding a groove but were brought back down to earth by a sluggish display in front of the returning Sir Alex Ferguson.
He was loosely involved in the goal which gave United an 18th minute lead, a first for new Brazilian signing Fred.
"I don't change that because we won two matches in the Premier League. So, I think, yes, it's a mental situation, and attitude, and again one team was coming to play the game of their lives, the other was too relaxed". The Wanderers are only one point behind the Red Devils, who sit in eighth.
"You see the level of the teams - you see Liverpool's squad, Manchester City's squad, Chelsea's squad, Tottenham's squad, and Arsenal are improving. We all know that is not the case (in the Premier League)", he said.
"He's my agent and that's it, but I think the work in Wolves is good because it is not just about the Portuguese influence - Portuguese manager, staff and players - it is also about getting the right ones". From a metal point of view their approach was more for a football match than ours.
Asked if Sanchez still has another level to reach, Mourinho added: "Every player has another level to step up".
"We start poorly, we start both halves at a low intensity, and it's hard to win matches when you are not there with everything you have".
"I want him to play totally fresh, so he's not playing [against Wolves]". I can't explain the difference of attitude because I never had a difference of attitude. "We were very clear with what we want to achieve and be able to compete against any team in the country".
Manchester United fans were absolutely delighted with Fred following his performance vs Wolves at Old Trafford. "He plays Tuesday again [against Derby County in the Carabao Cup]".