One a big problem of Madrid now is inconsistent to hold their performance along the match. The team sometime appears dominant, but then experienced a significant decline their performance. Ancelotti must pay attention to this problem. We don't know what is problem between player, or something happen with anceloti strategy, if this inconsistent not fix it immediately will have an effect to player confidence and cohesion. Madrid have the star player, but sometime many people asked about the squad depth, so if any star player injury that also impact with team and make the performance decreased drastically.
This is a natural thing because they did lose several important players in the team so that Real Madrid's overall performance did not go according to plan. But even so, Real Madrid's performance is not too bad, it's just that they failed to secure several wins so that Barcelona managed to occupy the top of the standings. Ancelotti must be really serious about facing this problem because if it continues to be left alone, the challengers will find it much easier to collect points.
Last I saw Carvajal on the list of injured players and he had undergone surgery so that conditions like this could continue to be a problem. Although there are a number of substitute players in that position, it may be different from the abilities possessed by Carvajal.