Amorim, 40, is the worst Man United manager in Premier League history with a with a win percentage of just 31.9%
It wasn’t until his outburst in the post-match press conference following the 1-1 Premier League draw with Leeds that United decided to pull the trigger, however.
The Portuguese manager alluded to issues behind the scenes, notably saying: "I came here to be the manager of Manchester United, not to be the coach of Manchester United.”
Neville, 50, one of the more vocal ex-Man United players, has now given his verdict on Amroim’s tenure and his subsequent dismissal.
“It means it's not worked, it means the decision making all the way through hasn't been successful,” Neville told Sky Sports.
"Particularly when you're sacking a manager part-way through a season, it's very difficult to get an adequate replacement in.
"I am surprised it's happened this morning. I'm not surprised it's happened. I didn't realise it would happen so quickly.
"I thought they'd get through another couple of weeks. Obviously it has become that challenging internally that they decided to do it very quickly. It was a shock this morning when I heard the news.
"There has to be a level of honesty that occurs when there are disappointing performances occurring.
"If you look at some of the performances in the last month they have been shocking.
"The Wolves game seemed to be the killer game, it was a bad one.”