Video: Arsene Wenger blasts Manchester United for Moyes treatment
Arsenal manager Arsene Wenger, now far and away the longest-serving Premier League manager having taken charge of the north London club in 1996, was dismayed that United had not stuck with Moyes and warned the high turnover of coaches would affect the quality of coaching in the long term.
"If you want quality people in any job, you need to give them time to develop and to become good, or people with the quality will not come into our job any more," he said.
"The average (job life) expectancy of an English professional club at the moment is 11 months, and that is quite unstable. Every guy who is married, has a family, will have a big hesitancy before he goes into that game.
"That means the quality of the coaching and the quality of the managing is under threat."
Manchester City boss Manuel Pellegrini said it was "a pity" that Moyes had been sacked so early into his United career.
Pellegrini said: "It is a pity for David Moyes because I think he is a very good manager, that is why Manchester United chose him to continue the work that Sir Alex Ferguson did for so many years. But I don't know the reasons they have. It is always not good for the club to sack a manager who has a contract who is just starting his work - and very difficult work after Alex Ferguson and a contract for six years."
Tottenham head coach Tim Sherwood thinks British managers like Moyes "don't get a fair crack of the whip" and that too much was expected of him.
"It's obviously a shame when anyone loses their job and it's a shame that David hadn't been given the time," he said
"I think anyone needs the time to imprint their own style on a team and it was a tough job to follow Sir Alex Ferguson.
"Everyone knew it was going to be a tough job for anyone who went in there.
"I've said previously, he is the hardest-working manager I've ever seen. Whenever I've ever been to a game, he is there unless there are people with David Moyes' masks on.
"The guy is everywhere, he is diligent, wants to do his job, he is hard-working and I just think he needed more time. People can't expect miracles."