[2] After coming through the youth systems Željezničar and Red Star Belgrade, Koroman played for Radnički Kragujevac, Spartak Subotica, and OFK Beograd in the First League of FR Yugoslavia.

[6] In February 2007, Koroman returned to Serbia and joined his parent club Red Star Belgrade on a seven-month loan deal.

In June 2011, Koroman returned to Russia and joined his former club Krylia Sovetov Samara, signing a two-and-a-half-year deal.

[14] He was a member of the Serbia and Montenegro team in the 2006 FIFA World Cup, making two appearances and receiving two yellow cards in the process.

[19] Red Star Belgrade Awards Koroman is a strong critic of the ruling Serbian Progressive Party (SNS) and called it the "greatest evil".

[21] Dragan J. Vučićević, editor of the pro-government tabloid Informer, accused Koroman of physically attacking him and insulting him on 30 May 2023.