Career
Lorenzetti joined Rosario Central youth squad in 1994. He made his professional debut for Rosario Central of the Primera Division Argentina on September 28, 2003. The coach at the time was Miguel Russo.
Lorenzetti made his first start on February 22, 2004 against Boca Juniors.
He also participated in Copa Libertadores 2004. In 2006, he was loaned to Chilean club Coquimbo Unido.
The team made it to the playoffs and Lorenzetti made 4 goals and twelve assist that season. Universidad de Concepción
In 2007, Lorenzetti was loaned again to a Chilean club this time U. de Concepción with an option to buy the player at the end of the year.
He again made the Chilean playoffs.
In the first round of the playoffs, U. de Concepción upset Universidad Católica. In the second leg of the semifinal against Audax Italiano, the number one seed, U. de Concepción was on the verge of elimination when Lorenzetti scored an amazing goal to qualify U. de Concepción to the final against Colo-Colorado In 2008, U. de Concepción picked up the option on Lorenzetti and bought the rights to the player.
Universidad de Chile
On 9 June 2011, Universidad de Chile signed Lorenzetti from Universidad de Concepción for a fee of United States$600,000 on a three-year contract.
In his second official game against Cobreloa, Lorenzetti scored two goals in the 3–1 victory of the club and was named the man of the match.
