|Date of birth||25 October 1983|
|Place of birth||Viareggio, Italy|
|Height||1.83 m (6 ft 0 in)|
|2014||→ Pisa (loan)||11||(1)|
|* Senior club appearances and goals counted for the domestic league only.
In summer 2003, he joined Pisa of Serie C1.
In 2004–05 season he joined Serie A club Brescia. On 12 September 2004, he made his Serie A debut against Juventus. He followed Brescia relegated to Serie B in summer 2005, and played until 31 January 2008.
He left for Serie A club Napoli on 31 January 2008, joining fellow Brescia players Santacroce and Hamsik, for a total fee of €18 million within a season. Mannini himself was tagged for €7 million. In January 2009 he was handed a one-year suspension by the Court of Arbitration for Sport (CAS) along with former teammate Davide Possanzini from WADA for being late for a drugs test following a Serie B match between Brescia and Chievo in December 2007. Later the ban was frozen by CAS due to appeal process., The ban was cancelled on 27 July 2009 after being proved there was no real intention to avoid the controls from Possanzini and Mannini.
Mannini made an excellent start in his first season at Sampdoria, scoring 5 goals in Serie A and 3 assists in just 8 games.
At the end of 2010–11 Serie A, Doria was relegated. The club gave up the co-ownership and allowed players to return to their mother clubs for a peppercorn fee of €500 each, such as keeper Gianluca Curci and winger Stefano Guberti. However the co-ownership of Mannini was not resolved before the deadline on 24 June. Thus, both clubs had to submit a bid in a sealed envelope to Lega Serie A in order to decide the highest bidder, which was only €500. on the other hand, Sampdoria abstain entirely from making an offer.
On 6 August 2011, Mannini moved to newly promoted Serie A club Siena in another co-ownership deal for €450,000 (plus €200,000 other fee) in a 4-year contract. In June 2013 Siena acquired Mannini outright for free after the club was relegated. Both clubs failed to form any deal before the deadline, but Napoli did not submit a bid.
Return to Pisa
Mannini was re-signed by Pisa on 27 August 2015.
- "Vitesse agree Yakubu loan". UEFA.com. 13 July 2004. Retrieved 31 January 2008.
- S.S.C. Napoli S.p.A. bilancio (financial report and accounts) on 30 June 2008 (Italian) PDF purchased from Italian C.C.I.A.A.
- "Napoli suffer Mannini ban". channel4. 29 January 2009. Archived from the original on 4 March 2009. Retrieved 19 March 2009.
- "Mannini's sigh of relief". channel4. 18 March 2009. Retrieved 19 March 2009.[dead link]
- "Comunicato stampa: acquistato Daniele Mannini" (in Italian). sampdoria.it. 9 July 2009. Retrieved 9 July 2009.
- S.S.C. Napoli S.p.A. bilancio (financial report and accounts) on 30 June 2010 (Italian) PDF purchased from Italian C.C.I.A.A.
- S.S.C. Napoli S.p.A. bilancio (financial report and accounts) on 30 June 2011 (Italian) PDF purchased from Italian C.C.I.A.A.
- "Italy to abolish shared ownership". ESPNFC. 28 May 2014. Retrieved 28 May 2014.
- "Mannini è un giocatore del Siena Stasera ad Abbadia la presentazione" (in Italian). AC Siena. 6 August 2011. Archived from the original on 27 May 2014. Retrieved 24 May 2014.
- S.S.C. Napoli S.p.A. bilancio (financial report and accounts) on 30 June 2012 (Italian) PDF purchased from Italian C.C.I.A.A.
- AC Siena SpA bilancio (financial report and accounts) on 30 June 2013 (Italian), PDF purchased from Italian CCIAA
- "Comproprietà: l'esito delle buste" (in Italian). AC Siena. 21 June 2013. Archived from the original on 3 July 2013. Retrieved 24 May 2014.
- "Mannini in prestito al Pisa" (in Italian). AC Siena. 31 January 2014. Archived from the original on 3 February 2014. Retrieved 24 May 2014.
- "Mannini in giallorosso" (in Italian). U.S. Lecce. 1 September 2014. Retrieved 18 July 2015.
- "Ufficiale: Daniele Mannini torna al Pisa. Inizia il suo terzo capitolo nerazzurro" (in Italian). A.C. Pisa 1909. 27 August 2015. Retrieved 13 January 2016.