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On 10 July 2011, Simón joined to Chilean Primera División club Unión La Calera for play the Clausura Tournament of that season, after of put end to his contract with Piacenza.
Costa made his official debut against Unión La Calera in a 1–2 top division defeat at Estadio Municipal Nicolás Chahuán, starting the match as right back, and being replaced by Santiago Dittborn, as Mirosevic eventually did not leave the club.