The bad results FC Barcelona got in the last times have taken a toll on Ronald Koeman. He had the feeling something was wrong within the squad, and saw the line up leaked in the press, that he had only told the players. He understably got angry and tried to find what player was the rat. And he found him.
Some minutes before that match, Koeman gathered the players and told them there was a snitch among them. Told them someone had leaked the starting eleven to the press without permission. And then, he went to this player in front of everyone and bluntly told him, 'You were the leaker'.
This player is Riqui Puig. Apparently, he got upset because he was not fully considered by Koeman and complained about it to someone he should not have to. Allegedly, Puig complained about it to a journalist as a revenge for not being nailed on often. And as a consequence, Koeman makes him play only when he has no other option.
Puig denied the accusation, and now he is looking for allies within the first team. It could be quite easy, because many players do not want Koeman already. But the coach would not risk his job for this, so there are two different voices in this conflicts and the internal crisis at FC Barcelona is getting worse and worse