|Date of birth||1 July 1974|
|Place of birth||Osijek, SFR Yugoslavia|
|Height||1.78 m (5 ft 10 in)|
|Croatia U17 (coach)|
|* Senior club appearances and goals counted for the domestic league only|
Born in Osijek, Socialist Federal Republic of Yugoslavia, Krpan started his career with local club NK Osijek. Due to the war breaking out in 1991, as a 17-year-old he engaged in battle to help save his hometown. He moved to Sporting Clube de Portugal in 1998, being scarcely used during his one-and-a-half-season spell.
In January 2000, staying in Portugal, Krpan left for U.D. Leiria and played for the team until the summer of 2001, initially on loan. He then returned to Croatia and played one season apiece for Osijek, NK Zagreb and HNK Hajduk Split, before returning to Leiria for 2004–05; he was an important attacking element during the campaign as the latter team barely avoided relegation from the Primeira Liga, notably scoring in a 1–1 away draw against FC Porto.
- NK Zagreb
- Hajduk Split
- Inter Zaprešić
- "Krpan otkriva kako je branio Hrvatsku: Boban je '98 Tuđmanu predavao raport s akreditacijom osječkog ratnika" [Krpan reveals how he defended Croatia: Boban gave lecture to Tudjman in '98 with the accreditation of the Osijek warrior] (in Croatian). Index. 29 May 2014. Retrieved 17 September 2017.
- "Sporting empresta Petar Krpan à U. Leiria" [Sporting loan Petar Krpan to U. Leiria]. Record (in Portuguese). 15 December 1999. Retrieved 14 May 2018.
- "Krpan: "O FC Porto não devia gostar muito de mim…"" [Krpan: "There certainly was no love lost between FC Porto and me…"] (in Portuguese). Mais Futebol. 19 February 2015. Retrieved 14 May 2018.
- "FC Porto-U. Leiria, 1–1 (Quaresma 8; Krpan 75)". Record (in Portuguese). 22 September 2004. Retrieved 14 May 2018.
- "De pena máxima" [Maximum penalty]. Mundo Deportivo (in Spanish). 1 July 1998. Retrieved 30 June 2017.
- "Predsjednik Tudjman odlikovao hrvatsku nogometnu reprezentaciju" [President Tudjman decorated Croatian national team] (in Croatian). Croatian Radiotelevision. 12 July 1998. Retrieved 25 November 2016.