[1] Nikolov spent his youth years at the academy of Levski Sofia to 2017.
[2] On 25 August 2023, Nikolov scored three goals in the 3:4 home defeat against table leaders Lokomotiv Plovdiv in a league match.
[4] On 7 April he received an injury in the league match against CSKA 1948 that turned out to be torn cruciate ligaments and meniscus and ruled him out until the end of the season.
[5] In March 2023 Nikolov received his first call-up for the Bulgaria U21 team.
[6] On 21 November 2023, he scored three goals in the 6:0 home win over Estonia U21 in a 2025 UEFA Euro qualifier.