|Full name||Ignacio David Fideleff|
|Date of birth||4 July 1989|
|Place of birth||Rosario, Argentina|
|Height||1.89 m (6 ft 2 1⁄2 in)|
|Playing position||Centre back|
|2004–2008||Newell's Old Boys|
|2008–2011||Newell's Old Boys||35||(3)|
|2012||→ Parma (loan)||1||(0)|
|2013||→ Maccabi Tel Aviv (loan)||7||(0)|
|2013–2014||→ Tigre (loan)||13||(0)|
|2014–2015||→ Ergotelis (loan)||7||(1)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 12 January 2016.
Fideleff was born in Rosario, Santa Fe and grown up as a footballer in Club Atlético Newell's Old Boys' youths. He made his debut for the Newell's first team on 24 March 2008 against Lanús, scoring a goal. He played for the club for five seasons, collecting 35 appearances in Argentine Primera División, scoring 3 goals.
At the start of the 2011–12 season, Fideleff was purchased by Serie A club Napoli, for a reported fee of around €3m, believed to be a substitute for Spaniard Víctor Ruiz who was sold to Valencia. He debuted in Serie A on 21 September 2011, featuring in the starting line-up against Veronese club Chievo.
On 30 January 2013, Fideleff joined Maccabi Tel Aviv on a loan deal for the remainder of the season. The deal came through after Fideleff received an Israeli citizenship due to his Jewish origins.
- "Fideleff tuvo su estreno y fue el autor del gol de Newell's" (in Spanish). La Capital. Retrieved 2011-09-24.
- "Fideleff to the Napoli. De Laurentiis: "A purchase that satisfies us"". Napoli official website. Retrieved 2011-09-24.
- "Napoli complete deal for Newell's Old Boys defender Ignacio Fideleff". tribalfootball.com. Retrieved 2011-09-24.
- "Santana and Fideleff transferred on loan to Torino and Parma". official website. Napoli. Retrieved 2012-07-14.
- "Ignacio Fideleff es jugador de Tigre" (in Spanish). ESPN Deportes. 5 August 2013. Retrieved 2013-08-05.