[2] On 6 July 2016, Sergeev was loaned to Chinese Super League club Beijing Guoan joining his national team teammate Egor Krimets.

[6] Though his countryman Eldor Shomurodov scored three weeks later, Sergeev remains at 28 years the oldest Uzbek goalscorer in the competition.

[9] On 25 December 2024, Pakhtakor announced the return of Sergeev from BG Pathum United to a one-year contract.

After the 2012 AFC U-19 Championship Sergeev came out as the top scorer of the tournament with 7 goals throughout as he led Uzbekistan's U20s to the semi-finals, where they lost to South Korea U20s 3–1.

[11] He made his debut for main team, Uzbekistan on 10 September 2013 in 2014 FIFA World Cup qualification match against Jordan.