Primarily a central midfielder, Blasi made his Serie A debut for A.S. Roma in a match against Piacenza on 22 January 2000. he also played for Lecce at Serie B before returned to Roma. In mid-2000 he was signed by Perugia at. Which he played 46 Serie A matches. In June 2001, he was signed permanently for 18 billion lire ), however, in terms of the signing of Giuseppe Cattivera also for 18 billion lire. In July 2002, he was signed by Juventus for about €17.7 million, and loaned back to Perugia in the first season. In the second season he joined Parma. He was suspended due to test positive for nandrolone until March.
Juventus
Blasi returned to Juventus F.C. in 2004, under Fabio Capello, his coach at Roma; he received his first Italy call-up in August. In his first season with Juventus, he was often partnered with his former Roma teammate Emerson in the centre of the team's midfield, in Capello's 4–4–2 formation, fighting off competition from Stephen Appiah and Alessio Tacchinardi for a starting spot, and collecting 27 appearances as Juventus won the league title. The following season, due to the injuries of Jonathan Zebina and Gianluca Pessotto, he often played as a right-back. Due to the arrival of Patrick Vieira and the emergence of Giorgio Chiellini, however, he often found a lack of first team opportunities both in midfield and defence, although he was awarded a new contract extension, which would keep him with the club until 2009. He made six starts for the club throughout the season, as the team won a second consecutive league title. While waiting for the outcome of the 2006 Italian football scandal sentences, which ultimately saw Juventus relegated to Serie B and stripped of their previous two league titles due to their involvement in Calciopoli, Blasi joined Fiorentina on a loan with an option to buy, under Cesare Prandelli, who had previously also been his coach at Parma.
Along with his former Juventus teammate Marcelo Zalayeta, Blasi was sold to newly promoted Serie A team Napoli for €1.4M and €2.45 million respectively in co-ownership deal in the summer of 2007. He signed a 5-year contract with the club. In June 2008, Napoli bought the remaining half of the player's registration rights from Juventus for €2.6 million. On 31 August 2009, Blasi was loaned to Palermo after he had played the opening match of the season against Salernitana in the Coppa Italia on 16 August. On 20 May 2010 he joined A.C. Milan on loan exclusively for a three-game friendly tournament in the United States.
Lecce
On 27 January 2012, Blasi signed with Serie A side Lecce during the January transfer window.
Blasi joined Varese in 2013. He spent two seasons at the club and was released in 2015.
Chennaiyin
Blasi joined Indian club Chennaiyin FC in 2015 after the expiry of his contract at Varese. He was retained in 2016, after a short spell at Ischia Isolaverde.
Coaching career
CPC 2005 Civitavecchia
On 12 January 2017 it was announced, that Blasi had joined Italian amateur club CPC 2005 Civitavecchia. However, in September 2017, he was announced as the clubs new manager.
On 23 May 2019, Blasi was named manager of the Maltese club of Hamrun Spartans for his first professional experience as a manager. despite reaching the quarter finals in the Maltese FA Trophy, he has been sacked by the club on the beginning of February 2020.
A dynamic, tenacious, combative, and hard-working box-to-box midfielder, with notable stamina, a powerful shot from distance, and good ball-winning abilities, Blasi is a tactically versatile player, who is capable of playing as a right-sided or central midfielder, or even as a defensive midfielder in the centre of a three-man midfield, where his main function is to break down opposition plays and distribute the ball to his teammates. He is also known for his leadership and team spirit, although he has also drawn criticism at times from his managers for committing too many rash fouls and for having a tendency to pick up cards. Primarily a midfielder, throughout his career, he has also played as a right-back on occasion. Due to his technical characteristics and wide range of skills, he has also been deployed as a deep-lyingplaymaker in midfield, in front of the back-line, courtesy of his good feet, distribution, and ability to switch the play.
