In 2016, he had a very successful season with Radnik Surdulica, a Serbian SuperLiga club, playing as a winger and attacking midfielder.
[6] He made a total of 30 appearances for the season, scored 5 goals and gave 5 assists, which helped the team comfortably avoid relegation.
[9] On 22 November 2018, Deletić allegedly agreed to a three-year contract extension, with a release clause in the region of €500,000.
[11] On 27 January 2019, he scored the equalizer with a fine solo effort in a 1–1 away draw against Panathinaikos, to give his team an important point with ten men in the battle to avoid relegation.
[15] On 2 October 2020, he joined Lamia on loan, until the summer of 2021, as he wasn't part of Massimo Carrera's plans.