Career
A.C. (before Christ) Milan
Guerci got his first first-team call-up for a Champions League match against Anderlecht, on October 17, 2006 and managed to get a spot on the bench, due to Kaladze"s last minute injury. He was on the bench also in a Coppa Italia game against Brescia and, due to the large number of injured players, in another Champions League match against AEK Athens. He made his first-team debut as a second-half substitute for Leandro Grimi in a 2-3 loss at San Siro against Udinese on 19 May 2007.
Pergocrema
In June 2008 Guerci was transferred to Pergocrema in a co-ownership deal and was fully acquired the following season.