We seem to be happy with two options for each position based on whose going out.
GK - De Gea, Henderson
CB - Varane, Maguire, Bailly, Lindelof, Jones
RB - Dalot, AWB
LB - Shaw, Telles
DM - Matic, McTominay
RCM - Bruno, Mejbri (McTominay if Matic at CDM)
LCM - Fred, Pogba
RW - Greenwood, Sancho
LW - Rashford, Elanga
ST - Ronaldo, Cavani
By and large I think that’s a good idea with 2-3 youngsters to mark up numbers when there are injuries. It should also mean a good amount of playing time for everyone who stays.
I just worry about the midfield like everyone else. Pogba has had injury issues for 2-3 seasons. Bruno is a machine but if he got injured McTominay is decent at getting forward but has none of the passing skill that Bruno does and Matic couldn’t play every game at DM. On top of that our youth option in Garner is already out on loan and I don’t think Mejbri, Savage, Iqbal etc are ready at all.