The Spanish star was shown a red card in the closing minutes of the first half of Barcelona's clash with Real Madrid at the Nou Camp.
Roberto was involved in a nothing collision with Marcelo off the ball and hit out at the Brazilian defender.
The flailing arm hit Marcelo on his shoulder and Twitter users were quick to call it a punch.
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One user wrote: "Sergi Roberto getting a red card for the wackest punch I’ve ever seen is pure comedy."
Another social media post read: "Why would Sergi Roberto punch though! Clear red!"
Another adamant tweet read: "Sergi Roberto did punch Marcelo. Pretty stupid"
Cristiano Ronaldo was also seen gesturing with a closed fist on television images.
Even with the La Liga title race over, there was plenty of bite and edge to the latest Clasico.
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