|Date of birth||20 March 1967|
|Place of birth||Santa Maria a Vico, Italy|
|Height||1.76 m (5 ft 9+1⁄2 in)|
* Senior club appearances and goals counted for the domestic league only and correct as of 21 October 2008|
‡ National team caps and goals correct as of 21 October 2008
Ruotolo started his career with Sorrento in 1984, but is best known for having been a key player for Genoa for over a decade; he joined the Grifone in 1988 to left it only in 2002 to join Livorno of Serie C1. During his spell at Genoa he lifted the 1996 Anglo-Italian Cup. He played for Livorno until 2006, except for a four-months time at Saudi Arabian side Al-Ittihad (February–June 2003), being part of both rosters which gained promotion to Serie B and then Serie A, and playing two top division seasons with the amaranto. He left Livorno in 2006 to join newly promoted Serie C2 club Sorrento in a comeback to his first professional team. He left Sorrento in December 2007 by mutual consent and then joined amateur Promozione side Massa Lubrense for the remainder of the season.
In July 2008, he returned to Livorno, this time as assistant to the newly appointed coach Leonardo Acori.
On 23 May 2009 Ruotolo was appointed on an interim basis to replace Leonardo Acori at the helm of Livorno for the final Serie B league game and the following promotion play-offs in an attempt to bring his side back to the top flight. He debuted with a late 3–2 away win to Ascoli that left his side in third place at the end of the regular season. In the promotion play-offs, Livorno was coupled with Tuscan rivals Grosseto in the semifinals: after a shock 0–2 loss in the first leg, Ruotolo's side managed to make an impressive comeback by defeating their opponent in a 4–1 home win that ensured Livorno a place in the playoff finals against Brescia. In the finals, Ruotolo then managed to guide Livorno to defeat Brescia 5–2 on aggregate, thus marking an immediate Serie A return for the amaranto club. He subsequently accepted an offer from Livonro to become the club's head coach on a permanent basis; however the move was later dismissed by the Italian Football Federation due to Ruotolo lacking the required UEFA Pro coaching badges, and Vittorio Russo was instead appointed as acting head coach, with Ruotolo being however often referred as the "real" Livorno boss.
He was removed from his assistant coach position on 20 October 2009, after a 1–2 home loss to Palermo. In January 2010 he was re-hired by Livorno chairman Aldo Spinelli, this time as new youth coach of the Primavera under-19 squad.
On 5 April 2010 he was reappointed back at the helm of Livorno, taking over from dismissed head coach Serse Cosmi, in a desperate attempt to save the team from relegation. He was this time allowed to act as head coach despite still not having the required coaching badges, thanks to a 60-day derogation from the Italian Football Federation. The attempt was not successful, and Livorno went down to Serie B after only one season in the Italian top flight.
On 14 December 2011 Sorrento unveiled Ruotolo as their new manager until the end of the season, after the sacking of previous manager Maurizio Sarri following the 4–0 away defeat to Pro Vercelli. By doing so he returned to the club where he had both begun and ended his playing career and thus reignited his close association with Sorrento and Campania, the region of his birth.
Since 25 October 2012 to the end of the season he has been the coach of Treviso in Lega Pro Prima Divisione, a position he kept till March 2013. He successively served a full season as head coach of Serie D amateurs Sangiovannese in 2015–16.
- "Ruotolo: Ex Genoa e Livorno rescinde con il Sorrento" (in Italian). Yahoo! Eurosport Italia. 8 December 2007. Retrieved 21 October 2008. [dead link]
- "RUOTOLO GENNARO – Convocazioni e presenze in campo" (in Italian). FIGC.it. Archived from the original on 27 September 2007. Retrieved 21 October 2008.
- "Acori: "Il Livorno ha una grande rosa"" (in Italian). Corriere dello Sport. 12 July 2008. Retrieved 21 October 2008. [dead link]
- "Staff tecnico" (in Italian). AS Livorno Calcio. Archived from the original on 29 December 2008. Retrieved 21 October 2008.
- "Cambia la guida tecnica del Livorno Calcio" (in Italian). AS Livorno Calcio. 23 May 2009. Archived from the original on 27 July 2011. Retrieved 2009-05-23.
- "Livorno, il terzo posto è conquistato, 3–2 in rimonta all'Ascoli" (in Italian). Calcio Toscano. 30 May 2009. Retrieved 21 June 2009.
- "Livorno, poker d'assi al Grosseto, 4–1 all'Ardenza ed è finale!" (in Italian). Calcio Toscano. 11 June 2009. Retrieved 21 June 2009.
- "Livorno earn promotion". SKY Sports. 20 June 2009. Retrieved 21 June 2009.
- "Primavera. Esonerato De Vincenzo, al suo posto... Ruotolo!" (in Italian). TuttoMercatoWeb. 13 January 2010. Archived from the original on 16 January 2010. Retrieved 6 March 2010.
- "Cambio alla guida tecnica: Ruotolo allenatore" (in Italian). AS Livorno Calcio. 5 April 2010. Archived from the original on 22 July 2011. Retrieved 2010-04-06.
- "Ruotolo e la cura del sorriso "Voglio un Livorno sfacciato"" (in Italian). La Gazzetta dello Sport. 6 April 2010. Retrieved 6 April 2010.
- "Calcio: Savona, Gennaro Ruotolo nuovo allenatore" (in Italian). La Gazzetta dello Sport. 4 June 2010. Retrieved 4 June 2010.
- https://web.archive.org/web/20120514174036/http://www.sorrentocalcio.net/stampa-e-multimedia/archivio-notizie/1080-gennaro-ruotolo-e-il-nuovo-allenatore-del-sorrento.html. Archived from the original on 14 May 2012. Missing or empty