Career
Milan
He started his professional career in the A.C. (before Christ) Milan youth system. He was then loaned to Serie C1 teams Livorno, SPAL, Monza (also co-ownership) and L"Aquila (also co-ownership) between 1999–2003 and Serie B team Avellino in 2003-2004 Serie B season. Parma
His 50% registration rights were bought by Parma in 2004 for €180,000 that became full ownership in 2005 for undisclosed fee.
Napoli
In 2007 he was signed by South.S.C. Napoli for €3.2 million.
Zaragoza
On 27 January 2010 Contini was loaned to Real Zaragoza with option to purchase. On 8 July 2010, Zaragoza made the purchase option, for €2 million and signed Contini on a three-year deal.
Siena
On 8 August 2011, after a year and a half in Spain, he returned to Italy, taken from Siena on a season-long loan for €300,000 with option to buy the registration rights. Contini wore no.80 shirt for 2011-2012 Serie A. In July 2012, Contini signed a permanent deal with Siena, which the club declared the total cost including misc cost was €1,374,239.
He signed a 2-year contract.
Contini changed to wear no.22 in 2012-2013 Serie A.
Atalanta
Six months after joining Siena definitively, he joined Atalanta for €1 million. Contini kept to use no.22 shirt for "blue-black". On 30 August 2013, he went on loan to Juve Stabia.