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However, his team loss the final of the playoffs championship against Universidad de Chile, Católica lost in the aggregate result for 4–3 loss, and Eluchans along with his teammates Rodrigo Valenzuela, Alfonso Parot and Francisco Pizarro protagonized a scandal insulting to the referee Enrique Osses.
During his first matches in the club, Pratto was criticized for his game, but at the end of the season the Argentine forward scored important goals against Universidad de Chile and Cobreloa, as Católica were proclaiming champions in the last week of the tournament after a 5–0 victory over Everton.
In January 2012, he joined to Primera División club Universidad de Chile, after the good work of Azul Azul, earning under Jorge Sampaoli's orders the Torneo de Apertura and the heart of the fans.