After the match, Real Madrid lost against Atletico Madrid some players in Real Madrid are now under more pressure and there is a chance for some punishment for these players.
What punishment do you mean?
If you mean Ancelotti will give the players punishment, it depends on the situation. Ancelotti doesn't have many options of the players, he can't give the punishment to not playing. He must be aware that he must focus on other competition (UCL, La Liga). Playing on those higher level competitions requires all the players of Real Madrid. Ancelotti even has a lack of players in attacking line.
Andriy Lunin had a bad performance in this game and he was one reason for Atletico Madrid to score four goals in this match.
That's why when they asked Ancelotti about their coach for the next game he said, he would use Kepa against Almeria.
It is a bit strange that Ancelotti prefer to choose Lunin as the goalkeeper in the big match. He must know that Lunin's quality is lower than Kepa. Ancelotti must be aware that the chance to lose is higher if he put lower quality of goalkeeper. Ancelotti can't blame Lunin, it may be his decision to choose Lunin as the goalkeeper on the match.