For now, Real Madrid is forced to use reserve players until the transfer window opens in January so they can add ammunition and now they must have prepared several names to recruit. They will definitely be shopping for a lot of players considering that many of their players are injured.
The Real Madrid that I know as a club wouldn't sign any new players until this season is over. They are going to use their reserve players until when the injured ones comes back fully because signing new players doesn't guarantee if they are going to win the league or not. It's not like there is going to be top players around to be se off by January.
I think if Carvahal, and Vinicious can make it back, the team will know how to handle the situation or if Ibrahim will make it quicker before Vinicious with Carhaval, the team can still do well and have their in the top but winning Laliga is not something I will bet on, the risk is very high at this point.