If one or two players were injured then maybe the Real Madrid management would not have worried about this matter but most of the starting eleven players are injured which is definitely a concern for any team. Real Madrid's bench XI is good enough, but if six or seven players are given a chance to make the regular XI from the bench at once, it is unlikely to do well there. Real Madrid have a much stronger squad this season than the team that won the Champions League trophy last season but luck has not helped them here so even after building such a strong squad they are now thinking about which players to play in which positions and who will be allowed to play. All this is due to the injury problems of some key players.
The problem that Real Madrid is currently facing is due to the coach's mistake, he put too much trust in players who often play regularly in the Starting XI so that he forgot to develop the best talents in the academy. Now some of Real Madrid's young players in the academy are starting to feel pessimistic about their chances of playing in the first team, this will be very detrimental to Real Madrid in the future because they could refuse to extend their contracts due to the very small chance of getting promoted to the senior team.
During a player crisis due to injuries like the one currently being experienced, Ancelotti prefers experienced players over academy players, this is very different from Barcelona who always promote players from La Masia every year, now they have become important players in the senior squad. Even now Real Madrid want to sign a right-back and a centre-back in January, this is the first time in 6 years they have taken advantage of the winter transfer window.