Unai Lopez opened the scoring for Rayo Vallecano, but Barcelona came from behind to secure the victory with goals from Pedri and Dani Olmo in the second half.
Rayo Vallecano coach Inigo Perez had no complaints after their 2-1 defeat at home to Barcelona.AdvertisementAdvertisementPerez said: "The calendar is what it is. We believe it is excessive, nothing is going to change no matter how much we protest. It is no excuse, we have fallen physically and football-wise for the first time. With their level it is difficult to sustain it for so long."
"Barcelona's victory is fair, it annoys me to say it because it makes me angry. We have to regularly maintain what we did in the first half.
"There are two very different halves, in the first everything planned goes well.
"There are good things, surely if we had drawn, it would have been unfair. My feeling would have been that the first half is a mirror that we must look at ourselves throughout the season on any field and against any team."