In the 2018–19 season, Culio started the season well when he scored the only goal of the game, scoring from a penalty, in a 1–0 win over Universitatea Craiova in the Supercupa României. However, in the second leg of the UEFA Champions League Second Qualifying Round against Malmö on 1 August 2018, he was sent–off in the 77th minutes for a second bookable offence, in a 1–1 draw; eventually, eliminating CFR Cluj from the UEFA Champions League. Despite this, Culio scored two goals throughout August. On 3 November 2018, he scored his second league goal for the side, in a 5–1 win over Botoșani. After his sending off, in a 1–0 win over Concordia Chiajna on 24 November 2018, he scored on his return, in a 3–0 win over Dinamo București on 4 December 2018. Culio scored the goal that clinched the fifth league title in club history when he converted a penalty against Universitatea Craiova on 12 May 2019. On 16 December 2019, Culio played his last match for Cluj against Astra Giurgiu, where he also scored a goal in a 2–0 win.