Education
His first and last involvement in the first team was after being named on the bench for Livorno"s game against Palermo on 26 April 2006, which finished 3–1 in favour of Livorno.
His first and last involvement in the first team was after being named on the bench for Livorno"s game against Palermo on 26 April 2006, which finished 3–1 in favour of Livorno.
Marchetti started his career with Livorno. During the next 2006-2007 season, he made his senior debut with Casale Calcio in Serie Doctorate.
In 2007 Marchetti joined Carrarese Calcio. Foreign two seasons, he earned 24 appearances in the fourth division.
In 2009 Marchetti signed for Legnano.
On 15 November 2009, he scored his first goal in his career, in a 1–1 draw against Crociati Noceto. At the end of the 2009-2010 season, Alessandro returned to Carrarese Calcio.
In January 2011, Marchetti joined Lucchese 1905. Marchetti netted Lucchese"s only goal in a 2–1 defeat at Benevento Calcio on 27 March.
In August 2012, Marchetti joined Bulgarian side Botev Vratsa.
On 22 May 2013, Marchetti scored his first goal in the Bulgarian A Group against Montana.