A 3-1 win over Tottenham on Saturday, however, meant that defeat for the Red Devils at home to relegation-threatened West Brom would confirm the win.
"I trust in my work", he said.
He added: "I think we were deservedly punished because we were masters in complication".
Meanwhile, United manager Jose Mourinho makes two changes to the team that beat Manchester City in the last game, with Eric Bailly replaced by Victor Lindelof and Juan Mata coming in for Jesse Lingard.
In the press conference before United's league game against West Brom, the Portuguese simply said there was nothing he could do about the current situation.
They are eight points adrift of the Premier League record for points in a season, Chelsea's 95 in 2004-05, and can become the first team to break the 100-point barrier, with a total of 102 possible from their remaining five matches.
They had Jose bloody Mourinho who has never not won a league title wherever he went.
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2,902 - defender Nicolas Otamendi has completed the most passes in the Premier League this season, with midfielders Fernandinho and De Bruyne also in the top five.
But the Spaniard believes leading City to the title would rank among his finest moments.
"They won because they were the best team, they lost only a few points". Previous times, we almost threw it away and that was a feature of every season we won it.
He said: "We've got faith in one another, the players, the staff. Things have gone a bit by the wayside this year".
'The best way to achieving that is to aim for stability at training level, during the working week, and from what I have seen in the past two or three weeks I am really happy with him'. "Everyone is disappointed. We didn't play well at all and it's a bad afternoon for us".
The champions' dominance has been evident across an impressive 28 league victories. Huddersfield and Crystal Palace won earlier, so time is running out for West Brom.