In December 2009, Carlos was acquired by Union Sports Club of San Felipe, where after a good performance, is called by Nelson Acosta, to join the ranks of Everton de Viña del Mar.
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Diego moved the following season to Deportes Temuco, Salas' team cross-town rivals, and then he moved to Barnechea, amateur team where was scouted by Unión San Felipe, first-tier club, with which relegated to Primera B in 2012, having very well performances despite of that, among which highlighted a penalty saved to Esteban Paredes in a 1–0 away loss against Colo-Colo at Monumental.
Jorge Sotomayor (born March 29, 1988 in Munro, Argentina) is an Argentine footballer currently playing for Unión San Felipe of the Primera B Chilena.
Luciano Araya (born August 5, 1993 in Junín, Argentina) is an Argentine footballer currently playing for Unión San Felipe of the Primera División B in Chile.
In January 2011, Trecco signed for Primera División club Unión San Felipe and after a successful season with the club of Aconcagua, he joined to Cobreloa in June, being runner-up of the Clausura Tournament with Nelson Acosta.