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|Date of birth||19 January 1976|
|Place of birth||Colleferro, Italy|
|Height||1.80 m (5 ft 11 in)|
|Playing position||Central Defender|
|2005||→ Arezzo (loan)||18||(0)|
|2008||→ Verona (loan)||12||(1)|
|* Senior club appearances and goals counted for the domestic league only.
Gonnella played more than 250 matches at Serie B.
In 1997, he joined Hellas Verona where he played until 2003. In January 2003 he joined Atalanta of Serie A, in exchange with Mauro Minelli. After the team relegated in June 2003, partnered with Gianpaolo Bellini he played as a regular starter in Serie B and won promotion back to Serie A. Since the return of Cesare Natali, he just played 9 league matches before left on loan to Arezzo in January 2005. Since 2005–06 season he left on loan at Pescara of Serie B and turned permanent in January 2007. After Pescara relegated, in July 2007 he left for Grosseto of Serie B.
In January 2008, he returned to Hellas Varona on loan to play at Serie C1. In March 2009, he canceled his contract with Grosseto.
Gonnella capped for Italy at 1992 UEFA European Under-16 Football Championship qualification and final phase. He also played at 1994 UEFA European Under-18 Football Championship qualification that lost to Russia U18 at qualification playoffs.
- "L' Atalanta rinforza la difesa: Gonnella" (in Italian). La Gazzetta dello Sport. 10 January 2003. Retrieved 8 February 2010.
- "Grosseto, Gonnella verso la rescissione" (in Italian). tuttomercatoweb.com. 25 March 2009. Retrieved 8 February 2010.
- "Anche Natale Gonnella è del Como" (in Italian). Calcio Como. 9 November 2009. Retrieved 8 February 2010.
- "UFFICIALE: Casale, altri due colpi di mercato". Tutto Lega Pro (in Italian). 14 August 2010. Retrieved 19 June 2011.
- "Mercato senza soste, arrivano Gonnella e Lanteri". AS Casale Calcio (in Italian). 14 August 2010. Retrieved 23 December 2011.