As a senior, he represented Atlético Lugano, Midland, San Telmo, Nueva Chicago, Laferrere, Colegiales, Argentino de General Pico and Lamadrid aside from a short period abroad with Chilean club Cobreloa.

[1] After retiring, Zahzú worked as manager of Midland[2] and Almirante Brown before joining Paraguayan side Nacional Asunción in 2003.

[22] After working at fellow league teams San José[23][24] and Nacional Potosí[25][26] in the following years, he moved to Peru in 2016 with Deportivo Coopsol,[27] before returning to his home country with Guaraní Antonio Franco.

[28][29] Zahzú returned to Peru still in 2016, with Defensor La Bocana,[30] but switched teams and countries again after taking over Dominican club Atlántico for the 2017 season.

[40] He resigned the following 6 March, after just six matches,[41] and took over Real Santa Cruz in Bolivia on 23 August 2023;[42] he left the latter in December, with his contract being due to expire.