[1] He made his international debut coming in as a second half substitute for Robert Jarni against Poland on 22 April 1998, which was his only appearance for the Croatia national team.

[6] After Zoran Mamić was sentenced to five years in prison on 15 March 2021, he resigned on the same day and was succeeded by Krznar, who made his debut as Dinamo head coach on 18 March in a 3–0 victory over Tottenham Hotspur at Stadion Maksimir, thus qualifying for the quarter-finals of the 2020–21 UEFA Europa League for the first time in the history of the club.

[16] On 16 August 2022, Krznar took charge of the reigning Slovenian PrvaLiga champions Maribor, signing a two-year contract.

[18] However, after a poor start to the 2023–24 season, Krznar terminated his contract by mutual consent and left the club on 2 October 2023.

[20] With Celje, he won the 2023–24 Slovenian PrvaLiga title, but left the club on 28 July 2024 along with his staff after his contract was terminated by mutual consent when Riera became available again following Bordeaux's financial collapse.