Thibaut Courtois, the goalkeeper for Real Madrid, took a swipe at Barcelona after they were crowned LaLiga champions on Saturday.
Los Blancos just needed a point to beat Espanyol, but they won 4-0.
With four games remaining, they have opened a 17-point lead over their nearest opponents, Sevilla.
Courtois has now pointed at their 4-0 loss to Barca in El Clasico as the key moment in the season.
“The key moment came after the Clasico,” Courtois told Movistar+.
“Some celebrated as if they had just won the title, that they had come back, but we kept our calm to beat Celta in a tough match and then Getafe, who are always difficult opponents.
“La Liga is a team effort. We all attack and defend. That day against Sevilla was crucial, coming back from 2-0 down when everybody thought we were on the floor and that killed our rivals a little.”