Barca had taken the lead through a penalty of their own when Lionel Messi stepped up to convert from the spot after Raul Albiol was sent off for a challenge on David Villa.
With eight minutes remaining, however, Alves was penalised for tripping his fellow countryman in the box, allowing Cristiano Ronaldo to level the match, and the Brazilian remarked that Marcelo had admitted to making the most of the challenge.
Sport quote the full-back as saying: “Marcelo told me it was simulation. He told me that his actions were influenced by the outcome of the game."
Dani Alves and his team-mates will have their chance to make amends when they take on Madrid once more in the Copa del Rey final at the Mestalla on Wednesday evening.