Sergiu Buș

CFR Cluj

Born in Cluj-Napoca, Buș began his senior career at CFR Cluj, where he totalled three goals from 19 Liga I appearances while playing sporadically between 2009 and 2014. Whilst under contract with CFR, he was loaned out to Liga II team Unirea Alba Iulia and Liga I teams Târgu Mureș, Gaz Metan Mediaș and Corona Brașov, respectively.

CSKA Sofia

On 7 July 2014, Sergiu Buș moved to Bulgarian side CSKA Sofia, under a two-year contract. He scored his first goal for "the Reds" 20 days later, in an Eternal derby 2–0 win over Levski Sofia. He repeated the feat on 25 October that year, netting the second in a 3–0 win.

Sheffield Wednesday

On 2 February 2015, Buș was signed by English club Sheffield Wednesday for an undisclosed fee. He registered his debut in the Football League Championship five days later, being brought on as a 63rd-minute substitute and obtaining the penalty converted by Will Keane for a 1–1 home draw with Cardiff City. He scored his only goal for Wednesday in a 1–1 draw with Huddersfield Town, on 4 April 2015. On 2 February 2016, Buș moved to Italian side Salernitana on loan for the remainder of the Serie B season. At the start of 2017, he returned to Romania and signed for Astra Giurgiu, for which he started in the Cupa României final 3–5 loss on penalties to FC Voluntari on 27 May. The following month, Levski Sofia confirmed the signing of Buș as a free agent. He played his second successive national cup final on 9 May 2018, as…

Buș was capped for the Romania national team at under-17, under-19 and under-21 levels. He was called up for the first time to the seniors for the UEFA Nations League group matches against Northern Ireland and Austria in September 2020, but did not make his debut.

As of 8 October 2026

Buș's elder brother, Laurențiu, is also a professional footballer. The latter represented CFR Cluj's rivals from Universitatea Cluj at both junior and senior levels.