"I am optimistic, but a hard season, yes", said Mourinho. "For sure hard season".
"I don't change that because we won two matches in the Premier League". Hard season for sure.
"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". It's going to be hard.
"Big stability in the team, the young ones are young boys with good potential and you can see the work of the coaching staff and the team is a really really good team".
However, they'll be up against an ambitious Wolves side who have made a solid return to the Premier League having taken eight points from their five games so far having gained promotion from the Championship last season.
"I think it is (a mental thing)", he said.
"I think the happiness, the confidence, the self-esteem was what pushed him to play the first match nearly without training against Leicester and played a very good match".
United go into the Wolves game on a run of three straight victories, conceding only one goal in the process.
Pressed on whether the 29-year-old needed to raise his game.
"Sanchez plays because Martial played 90 minutes [against Young Boys] and Sanchez played zero", said Mourinho.
Asked if Sanchez still has another level to reach, Mourinho added: "Every player has another level to step up".
The Red Devils crammed a lot into the start of the 2018-19 campaign, with an opening-day victory against Leicester overshadowed by back-to-back defeats to Brighton and Tottenham. "He plays Tuesday again", Mourinho was quoted as saying by the Mirror.
United will be hoping to make it four in a row at Old Trafford on Saturday when they welcome Wolves to Old Trafford, a side to now sitting one point behind the Red Devils in the Premier League.
"I think good results, good performances, they make miracles and bad results and bad performances, they make you look more exhausted, more upset, more ugly, more everything", Mourinho said.
'Football is a little bit like this.