The Wolves goal, in particular, was a major disappointment and recalled the worrying days of August when United lost consecutive games to Brighton and Spurs, while conceding three times in each.
But Mourinho was more concerned by what he saw as his team’s poor attitude as he came close to suffering consecutive home league defeats for the first time in his career
“I can’t explain the difference of attitude because I never had a difference of attitude,” he said.
“For me it is difficult to explain that.”
After throwing on Juan Mata and Anthony Martial as substitutes, United created a handful of late chances with Romelu Lukaku missing the best, heading wide from six yards.
But Wolves had chances of their own to claim a first Old Trafford win in 38 years and, in the dying seconds, substitute Adama Traore burst through only to shoot selfishly over the goal.
“What I want now is to work harder tomorrow than we did before,” said Nuno.
“It’s a growth, a building of the team. Let’s improve, let’s get better so we can (be) every week like this.”