I always keep 15red bags for emergency if GK injured, which only happened 3 times in my 7 years as a manager
so it is just a QS what you will do if he get injured during a match, will 3 times happened, and 3 times my substituted CB ended with rating 7 and a clean sheet this game till this moment is stupid with defender and GKs sharing same skills categories
i had another 18yo GK, he was so good he become a scout without any TP for 2 seasons, i rarely used him, he was pointless in my game, i rather pick someone else to be among my 7 substitutes, where you need a winger, mid, DM, AM, and many positions , beside it will free more spaces in my team when i need to sign new players without panicking