If faced with a choice I think Manchester United need a defender, I'm not saying the current players are bad but it's not a bad idea to prepare a better squad. Last season's experience should be an example of the failure of the defensive line even though there are many reasons there. Based on Man United transfer records this season, they are prioritizing the attack line by spending 150 million while for their defense line they only spent 4 million + new players from the academy. I don't understand why the coach is so confident in the current defense line or maybe he has other plans?
It seems that Ruben Amorim won't be signing any new players for the defense, as Manchester United already has many players in that area, even though their performance hasn't been solid enough. In my opinion, that's understandable, as they still need to adapt to fully understand the strategy implemented by Ruben Amorim, and in fact, most of them are inherited players from Ten Hag.
Ruben Amorim still continues to maintain the three man defensive scheme this season, and even though their performance hasn't been very satisfying, I think over time the Manchester United defenders will manage to find their best form. Manchester United attacking issues are more concerning, which is why they have spent the majority of their transfer budget to sign new forwards.