Iancu began his senior career at Viitorul Constanța in 2011, and at age 18 returned to Steaua București where he was previously a junior. He won six trophies with the latter, but has since had multiple brief spells since leaving the capital in 2015. On his second stint at Viitorul, Iancu aided to a league title in the 2016–17 season, and on his third netted 18 times to become the top scorer of the 2019–20 Liga I. He has competed professionally in three countries apart from his own, namely Turkey, Poland and Russia.
Internationally, Iancu represented the Romania national team at several youth levels including the under-21 side, before going on to record his debut for the seniors in 2020.
Iancu's first goal also came in a match against Callatis Mangalia, scoring the last of his team in a 5–1 away thrashing on 21 April 2012. By the end of the season which ended in promotion to the Liga I, he totalled five goals in twelve appearances.
Steaua București
Iancu continued his goalscoring run by netting six times from 18 games in the first half of the 2012–13 Liga I, which inspired a move to his former boyhood club FC Steaua București in the winter transfer window. The eventual champions acquired 70% of his economic rights for a rumoured €500,000 fee,[4][5] and his five-year contract included a €25 million buyout clause.[6]
Iancu did not impose himself at the Bucharest-based club and in the 2015–16 campaign was sent out on loan to Karabükspor in Turkey,[8] where he only scored once in four games.
Return to Viitorul Constanța
In the summer of 2016, Iancu rejoined Viitorul Constanța as a free agent. On 13 May 2017, he converted a penalty in a 1–0 defeat of CFR Cluj, which earned Viitorul its first national title.[9]
Termalica Nieciecza
In September 2017, Iancu joined Polish club Termalica Nieciecza on a two-year deal.[10] Two weeks later, he made his Ekstraklasa debut by coming on as a substitute and scoring the winner in a 2–1 victory against Lechia Gdańsk.[11]
Return to Romania
Iancu returned to Romania for the 2018–19 season, playing in quick succession for Voluntari and Dunărea Călărași before being once again re-signed by Viitorul Constanța in June 2019.[12] He managed to become top scorer of the 2019–20 Liga I by netting 18 goals from 28 appearances.[13]
^"Габриэль Янку перешёл в "Ахмат"" [Gabriel Iancu moved to "Akhmat"] (in Russian). FC Akhmat Grozny. 13 January 2021. Archived from the original on 13 January 2021. Retrieved 13 January 2021.
^"Bine ai (re)venit Gabriel Iancu !" [Welcome back (again) Gabriel Iancu!] (in Romanian). FCV Farul Constanța. 3 February 2022. Retrieved 3 February 2022.