 He returned to Lanús for the 2017–18 season and subsequently made his debut for the club on 11 December 2017 in a 3–0 defeat away to Chacarita Juniors.The opening goal of Martínez's Lanús career in July 2018 during a Copa Argentina win over Douglas Haig.Six months later, Martínez was loaned back to Primera B Nacional with Guillermo Brown.