Born in Mar del Plata, Longhi started his senior career with hometown club CA Kimberley, making his debuts in Argentine Primera División at the age of only 18.
Longhi scored his first goal in the main category of Spanish football on 26 March 1978, netting the first in a 2–0 success over Real Betis also at the Estadi de Sarrià.
After a one-year stint at FC Sant Cugat Esport, he returned to Espanyol; initially an assistant, he was an interim manager of the club during its 1–0 away win against Real Oviedo on 16 April 1989.
[5] On 28 November of the following year, as the previous manager Mauricio Pochettino was sacked, he was in charge of the main squad during a 0–3 Copa del Rey loss against Sevilla FC.
[10] He has denied any rift between him and Safiq Rahim, after the midfielder looked to have been reduced to a fringe player due to limited game time, as reported by FOX Sports Asia in an article.