It seems the game against Leganés was not good for Barcelona at all because other than losing the game with a 1-0 result against Leganés, they also got their player Yamal injured duding this match. While I was not expecting to see Barcelona lose this match they lost and even after Yamal got injured he wanted to stay in the team.
Now it seems he is going to be absent in the important match they are going to have with Atletico Mardid, and this can make everything harder for Flick and his players because Atletico Madrid is going to be a much harder competitor for Barcelona than Leganés.
Barcelona seem to abuse Yamal too much since the last season, and not only them but Spanish national team too. Barcelona must understand that it only damages a career of Yamal in long term and breaks the club plans as well. Yamal is important with Barcelona but they must proactively protect this talented users in order to be able to use him a long time.Now it seems he is going to be absent in the important match they are going to have with Atletico Mardid, and this can make everything harder for Flick and his players because Atletico Madrid is going to be a much harder competitor for Barcelona than Leganés.
This injury is an example, if Barcelona did not try to use him immediately after his recovery, he would have more time for achieving better fitness and perhaps would have not been injured again. It's already happened, could not be changed, but Barcelona can use this injury case of Yamal, to use him more carefully in future.