FC Barcelona is not at his best, financially speaking, and can't afford to get new players (even if it doesn't seem like they need it either). This can be a good opportunity for Real Madrid to catch up, although I'm not sure about who should they get among the players you mention. What is clear is that given their performance in La Liga, the worst option would be not to catch anyone.
The transfer window is already closed and of course Madrid wouldn't get anyone to improve their current performance until the end of season. It will be a big challenge for Ancelotti to use his current squad and try to make his players not get injured easily. But Madrid needs to bring a new player in needed position such as forward and full back.