Real Madrid midfielder Casemiro admits their draw with Levante wasn't good enough.
Real fell back into their bad habits for the 2-2 result.
"We can't afford to make these kinds of mistakes," Casemiro explained in his post-match interview.
"We have to look at things on a match-by-match basis.
"We are growing and have done many good things, but we made two mistakes today."
What has been worrying for Zinedine Zidane's charges this season has been how they have folded under pressure at times.
"We've made two mistakes and conceded two goals," added Casemiro.
"If you make mistakes then you will be punished.
"This team had the quality to hurt us and make us pay."