[5] However, he didn't feature for the Primera División club in senior football and returned to Rosario Central months after joining.
[3] Martinich remained there for two seasons, appearing in a total of twenty-seven matches; he also scored his first senior goal, netting in a Copa Argentina defeat away to River Plate on 29 July 2018.
[3] He appeared just once for the club, in a home loss to Ferro Carril Oeste in December, in a season that was ended early due to the COVID-19 pandemic.
[3] In September 2020, Martinich moved abroad to join Peruvian Segunda División side Santos.
[3][9] He scored his first goal for them in a 4–3 defeat to Unión Comercio on 18 November, having made his debut a few weeks prior against Cultural Santa Rosa.