Speaking to the media, Flick said: "I don't want to speak about my reaction, I think it's not good. Players have played for their national teams, but we have to play this match. We can speak about if it's the right time to play this tomorrow...
"We can also speak about playing Leganes away at 9 p.m. [on April 12 before the second leg of the Champions League quarterfinal against Borussia Dortmund]. When we play away, it's always at 9 p.m., so we arrive back late in the night.
"It's to do with recovery for the players. I am not happy with this. When you see other leagues with Champions League teams, it's different to here. When you play Champions League, it's not about Real Madrid against Barça, it's about protecting your Spanish teams. But we play, no excuses.
"We accept this. It's a task for UEFA, for FIFA that they say after international breaks it's necessary that players have three days rest. LaLiga say we have to play and we say 'Yes, we do it.'"