After his beloved club missed out on a 'Champagne Supernova' with FA Cup final defeat to Wigan, the ex-Oasis man believes that the owners were wrong to look back in angerManchester City's decision to sack manager Roberto Mancini.
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"He obviously didn't get on with a lot of people but I thought it was harsh," Gallagher told Absolute Radio at the Ivor Novello Awards.
"I think they should have given him another year. I was shocked, I've got to say."
The outspoken Mancunian, who in in July 2012 launched the club's new kit, added: "When you own the club and you've got to go you've got to go and that's it.
"He obviously didn't get on with a lot of people but I was a bit shocked.
"[Manuel] Pellegrini seems to have got the job," he concluded of the Chilean, who is expected to be unveiled at the Etihad Stadium before long.