Goalkeepers get injured all the time in real soccer or on here I always have a sub keeper in my team to use when necessary !!! hun why are you confused ???? this is part and parcel of being a soccer manager
If you have no sub keeper this late in the season see if you can pick up an old cheap one in the transfer market , or use red packs 15 is all he would need !!!!!!!!!!
In future have a sub keeper < however it used to be don't change in a game when your keeper gets injured has that changed now ????