As I wrote in another thread - height in defense is an issue. Yesterday Amas was outjumped in build up to first goal. Same with Fredricson who is 1.83m was easily outjumped by Schade for second goal, and didn't even contest a jump for the third. Yoro, Maguire probably clear for the second goal or at least better contest that ball (third goal).
In general yesterdays game just showed some youngsters are not ready and need loans (Amas, Fredricson, Obi). Others like Heaven, Collyer, Yoro can already handle their own and can be part of regular squad. And in general even after hundreds of millions spent we desperately need fresh quality players to improve threadbare and injury ravaged squad and to replace some old (Casemiro, Eriksen, Shaw, Lindelof) or mentally not up to it players (Rashford/Sancho) we can add league incompatible players (Antony) and you need 7 new players just to fill the squad.