Marcus Rashford's dramatic late winner capped Manchester United's fightback as they maintained their recent revival with a 2-1 win against Bournemouth on Saturday.
Rashford's close-range finish came after Anthony Martial's effort had cancelled out Callum Wilson's early opener for Bournemouth at Dean Court.
It was United's third victory in their last four Premier League games, extending an upturn in form that was started by the home victory over Newcastle United.
Mourinho had expressed his confidence before this game that United's position in the Premier League table would look very different heading into the second half of the season.
"I think by the end of December, which is the end of the first half of the Premier League, I think we are not going to be in the position we are now. We are going to be in a better position," he said.