Manchester United legend Gary Neville caused a bit of a stir on Twitter after Manchester City were crowned Premier League champions.
The Red Devils - who beat their Manchester rivals 3-2 at the Etihad Stadium last week - were beaten 1-0 at home by West Brom on Sunday afternoon to gift City the title.
Pep Guardiola's side were knocked out the Champions League last week but have won the league with five games to spare.
The former Barcelona and Bayern coach praised his team after beating Tottenham 3-1 at Wembley on Saturday night.
"In general, the performance was again outstanding - and that's the level we have had all season," Guardiola said.
"We have 87 points now with five games left because we have been outstanding.
"People who say it was a big fail last week don't understand absolutely anything about football."
Gary Neville slammed by rival fans on Twitter
Instead of congratulating Man City on Sunday evening, Neville posted a tweet laughing at their lack of success.
Historically, Man United are the most successful club in English football - whilst their local rivals have won fewer league titles than Aston Villa and Sunderland.
Neville's post-match tweet, which certainly didn't ooze class, angered rivals supporters who responded in their droves.
Man United haven't won a league title since Sir Alex Ferguson retired and Neville is evidently beginning to resort to talking about the club's history.
Neville, who won eight Premier League titles during his time at Man United, was mocked for his salty response after Man City claimed their fifth title.
The Reds are sure to spend heavily in the summer transfer window as they bid to launch a title challenge under Mourinho next season.
Mourinho spoke with a little more class after losing 1-0 to West Brom.
"I congratulated Man City face-to-face when I had the chance because I knew they would do it," the manager told reporters.
"If I was them I would be very disappointed if people said they won because West Brom beat Man United. They won because they were the best team. They only lost two games."
They were simply outstanding all season long.
Meanwhile, Man United and 3rd placed Liverpool are now separated by just one point, although Jurgen Klopp's side have played one game more.