According to TransferMarkt, no Real Madrid defenders are injured except for Bellingham.
So it is likely that Real Madrid's entire defense is now ready, meaning Xabi does not need to worry about starting the league later and they can return to playing the key players they really need.
So far, there has been no news that Real Madrid will add more players to their defense.
Real Madrid will start the season with it's first term defenders all back from injury for the very first time in three long seasons. The last two seasons has been hell for them in the defence as they struggled with several injuries in that back line but this season will be different, I just hope so for them. Bellingham will really be missed but his return is scheduled for October if I'm not mistaken.