Only Lucas Vázquez as the left defender recently for Real Madrid after Dani Carvajal got injury and out until the end of this season, its big problem because Madrid less option for left defender position than central defender because have other player can play well on that position. No doubt with Carlo Ancelotti tactician how make rotation and moving some players put them on new position, but have an exceptional because Ancelotti never make huge rotation on left defender although with possibility for playing Eder Militao on Dani Carvajal's position.
I think two months left before January window transfer opening, Madrid need new approach for signing new players on left defender position because have many important match on second half make most busy schedule matches with Madrid will play on FIFA Club World Cup indeed have target keep defending the La Liga and UEFA Champion League trophy in this season.
Carlo Ancelotti can indeed make some changes or rotation of players to cover the gaps due to the many injured players but it will not be effective, now the situation in the Real Madrid team is very difficult and they must bring in new players in the January transfer market later, otherwise it is likely that Real Madrid will not be able to compete for the title.
For two months before the transfer market opens, maybe Carlo Ancelotti can still survive with the existing squad as we know that Carlo Ancelotti is a coach with a lot of experience and he should know what he is doing.
Based on the prevailing circumstances rocking the Real Madrid team at the moment, it is obvious that rotation policy is the the only option that Coach Carlo Ancelotti has to engage to keep the team moving until another transfer window open in January 2025, and just maybe before then most of the injured players may have recovered or would have been fit to start playing again, but for now it only necessary that the coach has to assign some players to some strange position they are not really used to and also give some players from the reserve team the opportunity to cover up for the injured players which is also a way of encouraging and discovering new talents.