Favalli started his career at 3rd division (Interior) side Racing de Córdoba.
In 2006 Favalli was spotted by scouts from Apollon Kalamarias, and was signed by the club during the summer 2006 transfer window.
[2] On 21 June 2013, after seven years in Greece, Favalli signed a one-year contract with Argentinian Primera B Nacional club Instituto de Córdoba for an undisclosed fee.
[3] As a result of his excellent performance, he signed with Huracán, helping the club to promote to the Argentinian Primera Division after the play-offs.
[4][5] On 21 January 2016, he signed a six months' contract with Super League rivals AEL Kalloni on loan from Levadiakos.