Career
He was drafted in the first round, 19th overall, by the Phoenix Coyotes in the 2002 National Hockey League Entry Draft. Whilst in the Coyotes system, Koreis played with American Hockey League affiliate, the San Antonio Rampage, before leaving North America at the end of his entry level contract with the Coyotes unable to debut in the National Hockey League. On September 3, 2014, Koreis signed a three month trial contract with European Commission KAC of the Austrian Hockey League (EBEL).
After only 6 games with Klagenfurt, Koreis opted to terminate his contract and return to former Czechoslovakian club, The Human Context Kometa Brno on October 7, 2014.