Leicester fan supports the sacking of Claudio Ranieri
The now former Foxes manager led them through one of the most historic seasons in English footballing history last term.
Leicester's incredible title triumph saw them dethrone Chelsea as Mourinho's contract was terminated in December 2015.
Coincidentally, a 2-1 defeat at the King Power Stadium was the Portuguese's last match in charge of Chelsea before he was given the boot.
Since the summer though, Mourinho has steadied the ship at Manchester United, while Ranieri has struggled to replicate anything close to last season's achievements.
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Claudio Ranieri and Jose Mourinho are good friends from their time in management
Wednesday's 2-1 loss away at Sevilla in their last 16 first leg was seen as a decent result on the back of a horrid start to 2017.
Following the decision, Ranieri has received much support from pundits, former players and managers.
And last night, Mourinho took to Instagram to do the same and outline how crazy the footballing world has become.
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Jose Mourinho's Man United scored seven goals in two Premier League games this season v Leicester
Nobody can delete the history you wrote
Jose Mourinho
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Along with a picture of the pair smiling together, Mourinho wrote: "CHAMPION OF ENGLAND and FIFA MANAGER OF THE YEAR sacked.
"That's the new football Claudio. Keep smiling AMICO (friend).
"Nobody can delete the history you wrote."
Claudio Ranieri became the fifth Premier League manager to lose his job this season, following Francesco Guidolin and Bob Bradley of Swansea, Alan Pardew of Crystal Palace and Mike Phelan of Hull.
Nobody has yet been lined up by the club to take over from the 65-year-old, but ex-Leicester boss Nigel Pearson, Pardew and Avram Grant are among the suggested candidates.
Leicester must now prepare without a manager for their next clash on Monday night (8pm) at home to Liverpool.
Meanwhile, Mourinho's United take on Southampton at Wembley on Sunday (4.30pm) in the EFL Cup final.