I think it is not wise to blame Amorim just because they lost this match. Of course there is a difference between Sporting and Manchester United. And there is also a difference in quality between the Portuguese League and the EPL. But I do not underestimate the Portuguese League. In fact, Amorim can beat City in the UCL. I think for now Amorim still needs time to adapt. On the other hand, I think Amorim still cannot implement his tactics effectively because he has to utilize the resources available. I wonder if someone expects instant results after years of being down. I think maybe Amorim can finish this season by trying to adapt and be better next season.
The new coach is indeed not to be blamed, especially if Amorim has only faced several matches in the Premier League with Manchester United so he should not be blamed because he will definitely make new directions as his own evaluation before facing the next match in any competition. Actually, I look more at the Manchester United players at this time where some positions may need to be replaced with others so that Amorim can know that the players he currently relies on are still not optimal enough to boost the team's performance to be better.