2011–12 season, FK Čelik won the Second League, making few all-time records – most points by single-season (80), highest number of wins (25), or longest unbeaten run (23 games) and longest winning streak (10 games). During the same season, FK Čelik became the first-ever and only Montenegrin Second League member which won the Montenegrin Cup. On the road to the final, they eliminated Blue Star (2:0), Lovćen (1:0, 1:0), Bokelj (1:1, 1:0) and Jedinstvo (3:0, 0:1). In the finals, on 23 May 2012, FK Čelik defeated First-League side Rudar – 2:1 (2:0) and won their very first and, by now, the only national trophy. Winning the cup allowed the club to enter the 2012–13 UEFA Europa League qualifying phase, where they beat Bosnian powerhouse Borac Banja Luka on away goals (1:1, 2:2). Facing Ukrainian club Metalurh Donetsk in the second qualifying round, the team garnered even more attention from the local media as the players and staff traveled from Nikšić to Donetsk (2,143 kilometers) by bus, which, after being denied entry to Moldova, lasted approximately 70 hours on the road. The team, having arrived in Donetsk on the same day of the match, lost the first leg 7–0, giving Metalurh its most historic win in UEFA competition. While Čelik played with much more resistance in the second leg, the team was eliminated from the UEFA Europa League after the game ended 2–4 for Metalurh. Soon after their European debut, FK Čelik started their first-ever season in Montenegrin First League. They won third-place, behind Montenegrin strongest teams Sutjeska and Budućnost, but also played in the final of 2012–13 Montenegrin Cup. This time, FK Čelik was defeated by FK Budućnost (0–1). With that results, team from Nikšić played another European season, in 2013–14 UEFA Europa League. Their opponent was Hungarian side Budapest Honvéd FC (1–4; 0–9). Next year, FK Čelik again won third place in the First League, with another performance in 2014–15 UEFA Europa League qualifying. This time, they faced Koper from Slovenia (0–5; 0–4). Before the start of the 2014–15 season, the club informed the Football Association of Montenegro that because of financial problems it would not be able to play the 2014–15 season in the top flight, and re-emerged in the Montenegrin Third League. After two seasons in the lowest-tier, FK Čelik gained promotion to the 2016–17 Second League. In March 2018, the club was on the brink of