Sir Alex Ferguson said it was amazing that Roberto Mancini was sacked as boss of Manchester City last week.
Ferguson, who will retire at the end of the season, admitted that he wasn't surprised that the Italian lost his job, despite having won the Premier League and FA Cup in previous years.
The United boss told reporters: "It is quite amazing. He has won the FA Cup, been in the final, second in the league and won the league and it's not good enough?".
"I was surprised, but actually no, you can't say you are surprised not with some owners today. You can't be surprised, but I still don't think it was right."
Ferguson also discussed the short tenures of managers in the English game and was left bemused that Brendan Rodgers is the 30th longest serving manager in the English game.
The retiring United boss continued by saying: "I was with the chief executive of Liverpool at our reserve game the other night and he told me that Brendan Rodgers, who has not been in the job a year, is the 30th longest-serving manager in the country. That's incredible."
For Manchester City, their owners have said they want a more "holistic approach" to next season as the side will end the season without a trophy.
Brian Kidd is currently is in charge at the Etihad outfit and he led the Citizens to a 2-0 victory over Reading on Tuesday night. City's final game of the season will come against Norwich City this weekend.
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