He dismissed talks of being carried away following last weekend's derby win against Manchester City.
"I know how to win, I believe in myself but I don't play", he added.
United had the opportunity to prolong City's wait to secure title glory by another week when they took on West Brom this afternoon.
"I think he has to try to keep that level of stability and, from that stability of course will appear the special match with the special performance, like it happened against City".
"The last title was not 20 years ago it was three years ago".
Manchester United's French midfielder Paul Pogba celebrates scoring their second goal to equalise 2-2 during the English Premier League football match between Manchester City and Manchester United at the Etihad Stadium in Manchester, north west England, on April 7, 2018.
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"We were masters in complication, everything was complicated", Mourinho told Sky Sports. Probably because I won eight championships, I was not in the moon with the victory against them. Not just the performance level but also the mental level, the day-by-day, everything must be consistent, since day one until the last day. "In my opinion, it affected for sure some of the people that were too happy just with that", United manager explained.
Juan Mata echoed comments from Mourinho, accepting United were far below the required standard in defeat to West Brom. We could not play fast, we could not think fast, everything was complicated.
"I congratulate them", Mourinho said. Players didn't play simple.
The Portugues was then asked of his frustration considering that City won the title on the back of United's loss. "So one of the things we have to improve is consistency".
"I have won titles, I would not be happy if someone said I won title because someone lost a match".
I will tell you what I told him after the [City] match and it's exactly what I told him - I don't expect you to be man of the match every week, I don't expect you to score two goals every week.