Barca had taken the lead through a penalty of their own, when Lionel Messi stepped up to convert the spot-kick 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.
“Marcelo told me it was simulation. He told me that his actions were influenced by the outcome of the game,” the full-back was quoted as saying by Sport.
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.