Career
Buș began his career at CFR Cluj where he made 22 Liga I appearances, scoring three goals. Whilst at Cluj he spent time out on loan at Unirea Alba Iulia, Târgu Mureș, Gaz Metan Mediaș and Corona Brașov before joining Bulgarian A Football Group side CSKA Sofia on a permanent basis in the summer of 2014. CSKA Sofia
On 7 July 2014, Buș signed as a free agent with CSKA Sofia on a two-year deal.
Sheffield Wednesday
Buș signed for Sheffield Wednesday for an undisclosed fee, rumoured to be around £375,000 plus add-ons, on 2 February 2015.
He made his debut five days later, as a 63rd-minute substitute for Joe Mattock in a 1-1 home draw with Cardiff City. He was fouled by Matthew Connolly for the penalty which Will Keane converted for Wednesday"s equaliser.
= Salernitana (loan) On 2 February 2016, Buș joined Italian side Salernitana on loan until the end of the season.