|Date of birth||16 October 1978|
|Place of birth||Ivrea, Italy|
|Height||1.82 m (5 ft 11 1⁄2 in)|
|Playing position||Right back|
|1999–2001||→ Vicenza (loan)||47||(3)|
|2003||→ Fiorentina (loan)||15||(0)|
|2004||→ Reggina (loan)||14||(0)|
|2005–2006||→ Ascoli (loan)||31||(3)|
|* Senior club appearances and goals counted for the domestic league only|
He joined Torino in summer 1997, and played 12 games in two Serie B seasons. After Torino won promotion to Serie A, he was farmed to Vicenza, where he won promotion again. He made his Serie A debut during on loan at Vicenza on 1 October 2000, in a match against AC Milan. Comotto returned to Torino in summer 2001, and played his first Serie A season for Torino.
Torino relegated in summer 2003, and Comotto successively played for Reggina (Serie A) and Fiorentina (Serie B), and then returned to Torino in 2004. Comotto helped the team win promotion back to Serie A again.
Roma and Return to Turin
However, because of the bankruptcy of Torino Calcio, Comotto was released for free in July 2005. Instead of signing a new contract with new Torino (Torino F.C.) in Serie B, he signed a 3-year contract with AS Roma, worth €600,000 per season in gross, on 18 August, and loaned him to Ascoli until the end of the 2005–06 season. Comotto was re-signed by Torino in summer 2006 in a temporary deal, for €250,000 loan fee. Turin bought back 50% registration rights of Comotto in January 2007 for €1.05 million and Torino got the full rights in June 2007 for another € 1.525M, making his transfer fee was € 2.825 million in total.
Comotto captained Torino in 2007–08 season, but his season came to early end at March 2008 due to injuries.
On 5 July 2008 Comotto signed for Serie A club Fiorentina for €4.8 million (but also cost La Viola an additional €198,000 as other fee) A bad injury excluded Comotto from the Champions league squad list for 2008. He made his Viola debut on 21 September 2008 in Fiorentina-Bologna, which finished 1–0. He also made his debut in the Champions League in the first leg of the qualifiers against Sporting Clube de Portugal on 18 August 2009 in the Stadium Jose Alvalade. He was the starting right-back in 2008–09 and 2009–10 season, but lost his place to Lorenzo De Silvestri in 2010–11 Serie A season. That season he only started 16 times and only re-picked by coach in October after he criticized his squad is a reason for bad results.
Fiorentina sporting director, Panteleo Corvino confirmed that from 4th September, Gianluca Comotto will be appointed as the club's new head of scouting. The club's attention will be turning to finding emerging talent in Portugal and Spain. 
- Perugia, l’annuncio di Comotto: «Lascio il calcio giocato, con il Grifo la gioia più bella»‚ umbria24.it, 3 February 2016
- "Comunicato Ufficiale N°41/A (2005–06)" (PDF). Consiglio Federale (in Italian). FIGC. 15 July 2006. Retrieved 1 September 2016.
- "RELAZIIONE SEMESTRALE AL 31 DIICEMBRE 2005" (PDF) (in Italian). A.S. Roma. 24 March 2006. Archived from the original (PDF) on 8 June 2012. Retrieved 1 September 2016.
- "RELAZIIONE SEMESTRALE AL 31 DIICEMBRE 2006" (PDF) (in Italian). A.S. Roma. 10 May 2007. Archived from the original (PDF) on 8 June 2012. Retrieved 1 September 2016.
- "CESSIONE A TITOLO DEFINITO CON ACCORDI DI PARTECIPAZIONE DEL DIRITTO ALLE PRESTAZIONI SPORTIVE DEL CALCIATORE GIANLUCA COMOTTO" (PDF) (in Italian). A.S. Roma. 5 January 2007. Archived from the original (PDF) on 8 June 2012. Retrieved 1 September 2016.
- "APPROVATA SITUAZIONE MENSILE AL 30 GIUGNO 2007" (PDF) (in Italian). AS Roma. 1 August 2007. Archived from the original (PDF) on 9 June 2012. Retrieved 1 September 2016.
- Torino F.C. S.p.A. bilancio (financial report and accounts) on 31 December 2008, PDF purchased from Italian C.C.I.A.A. (in Italian)
- ACF Fiorentina S.p.A. bilancio (financial report and accounts) on 31 December 2008, PDF purchased from Italian C.C.I.A.A. (in Italian)
- "Gianluca Comotto è un giocatore del Cesena" (in Italian). Cesena. 9 July 2011. Retrieved 9 July 2011.
- "Calciomercato Perugia, ingaggiato il difensore Gianluca Comotto" (in Italian). Perugia. 8 July 2013. Archived from the original on 14 August 2013. Retrieved 11 August 2013. Cite uses deprecated parameter
- (in Italian) Player stats