Manchester United tried to get something from the match but their efforts were futile.
"I had a feeling when I woke up this morning", Kompany said.
"Normally, we are going to have more of the ball and, normally, it's when we need somebody from the back to add extra technical quality in the middle of the back [four]". "If I was in their position, I would be very upset if someone said they won because United lost against West Brom".
The United manager also gave a strong defence of his own record, listing some of his achievements with Chelsea, Real Madrid and Porto, after being asked how United could expect to overhaul Pep Guardiola's team next season. "Maybe also City will invest massively and they don't let the others close the gap to them, I don't know", said Mourinho.
Former England worldwide Gary Lineker, who now work as a television presenter, tweeted: "Congratulations to @ManCity on winning the Premier League title".
Pep Guardiola will be delighted to have won two trophies this season, but will be determined to go one step further and win the Champions League next season - something he has not done since leaving Barcelona in 2012.
The Red Devils have already exceeded last season's Premier League points total of 69 this term, having amassed 71 with six games remaining. The Baggies have struggled to muster any sort of positive result of late and are unlikely to pull off a miracle like their did under Tony Mowbray years ago.
United delayed City's title celebrations by winning last week's derby at the Etihad Stadium but Mourinho admitted that victory had a hollow feel.
"I think we were deservedly punished".
"I came here to try to win the Premier League every year".
Perhaps it is more fitting that they were awarded the title because their biggest rivals lost to the team bottom of the table.
Right-back Kyle Walker, who joined Man City last summer, said: "We did it!"
West Brom were 12 points adrift of safety, winless in the league since January prior to kickoff and under the watch of caretaker boss Darren Moore, but offered the hosts an early warning shot with a couple of chances.