Collavini's career began with Talleres of Remedios de Escalada.[3][4] His spell with the club lasted four seasons from the 2005–06 campaign, with the defender appearing seventy-three times and scoring seven goals; six occurred during 2008–09, which included a brace over Central Córdoba in February 2009.[2][3] In the succeeding July, after suffering relegation with Talleres, Collavini remained in the division after agreeing terms with Tristán Suárez.[2][5] He scored nine goals across three seasons with the third tier side.[2][6] Collavini spent the 2012–13 campaign in Primera B Nacional with Atlético Tucumán, scoring one goal across fifteen encounters.[2][7][8][9][10]
Collavini returned to Primera B Metropolitana in June 2013, subsequently having stints across the following two years with Atlanta and Almirante Brown.[2][11] January 2016 saw Collavini sign for Deportivo Riestra.[2] Fifteen appearances followed in two seasons, with the team earning promotion to Primera B Nacional in 2016–17.[2] His first appearance for them in the second tier arrived on 11 December 2017 versus Santamarina, in a season that saw them relegated back to tier three.[2]
