Lomónaco started his professional career in 2016, making his debut on 18 December for Arsenal de Sarandí in a Primera División match against Vélez Sarsfield.[1][2][3][4] He scored the first goal of his career in a defeat to Olimpo on 23 February 2018.[1][5] In June 2019, after scoring seven goals in thirty-six matches for Arsenal de Sarandí, Lomónaco agreed to a move to Godoy Cruz.[6]
In the second half of 2019, he transferred to Godoy Cruz on a four-year deal.[7]
To gain more playing time, Lomónaco was loaned out to his former club, Arsenal de Sarandí, in January 2022 until the end of the year.[8][9] In 2023, he was loaned out to Chilean Primera División club Unión La Calera.[10] The following season, he was loaned to Greek club Panetolikos on a one-year deal with an option to buy.[11]
International career
Lomónaco was called up by the Argentina U23s for the 2019 Pan American Games in Peru.[12] He scored a goal in the group stage against Panama on 4 August.[1] Lomónaco made four appearances as Argentina won the tournament.[1]