Real Madrid defender Antonio Rudiger was filmed mocking Barcelona's shock defeat by Leganes.
On Sunday night, Hansi Flick's men looked to get their La Liga title charge back on track after recent slip-ups against Real Betis, Las Palmas and Celta Vigo.
Barcelona took on relegation-threatened Leganes at the Estadi Olimpic Lluis Companys but fell to a shock 1-0 defeat after Sergio Gonzalez netted the only goal in the fourth minute.
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As a result of the defeat, Barcelona could drop down to third place in the La Liga table if Madrid and Atletico Madrid win their games in hand.
Atletico are only behind Barcelona on goal difference and Madrid are currently in third, a point behind the leaders.
Speaking after the game, midfielder Pedri said to TV3: "It is impossible to leave happy today. I think we started a little asleep, they scored that goal against us. And then we woke up, we created chances, but we lacked spark.
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"We have to get into the games better. When a team like that scores quickly, they put a lot of people behind [the ball]. And we lacked the spark I said and clarity in front of goal. We're on a bad run and we have to improve."
A video then went viral on social media which showed Madrid star Rudiger laughing as he had the Barcelona score up on his phone.
As reported by Forbes, the clip was filmed by an influencer at a Red Bull event that Rudiger attended. You can watch the footage below.
Rudiger played for Madrid on Saturday night as they also dropped points in the race to become La Liga champions.
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During what was an entertaining night at the Estadio de Vallecas, Rayo Vallecano managed to hold the reigning European champions to a 3-3 draw.
Vallecano went 2-0 up thanks to Unai Lopez and Abdul Mumin before goals from Federico Valverde, Jude Bellingham and Rodrygo made it 3-2.
However, Carlo Ancelotti's men failed to see out the victory as Isi Palazon equalised in the 64th minute.
Madrid are back in action on Wednesday when they take on Mexican side Pachuca in the FIFA Intercontinental Cup in Qatar.
Topics: Antonio Rudiger, Real Madrid, Barcelona, Leganes, La Liga, Football
Marcus Chan