[6] After featuring regularly for Vojvodina in the opening two months of the season, Miletić was transferred to Belgian club Westerlo in late August 2016.

[9] Miletić made his official debut for Partizan on 22 July, playing the full 90 minutes in the league's opener versus Mačva Šabac and contributing to a 6–1 success at home.

He scored his first goal for the club in the Serbian Cup quarter-finals against Javor Ivanjica on 14 March 2018, helping his team to a 2–0 away win, which enabled them to advance to the semi-finals.

Miletić finished his debut season as the team's second-most capped player with 50 appearances across all competitions, helping Partizan advance to the UEFA Europa League knockout stage after 13 years.

[11] On 2 August 2018, Miletić scored his first goal in UEFA competitions, equalizing against Lithuanian club Trakai in a 1–1 away draw in the second leg of the Europa League second qualifying round.

[12] He also netted the equalizer to set the score at 1–1 in an eventual 3–2 home win over Danish side Nordsjælland two weeks later in the return leg of the third qualifying round.

[16] In early October 2018, Serbia manager Mladen Krstajić invited Miletić to the team ahead of their UEFA Nations League games with Montenegro and Romania.