[7] Blasi returned to Juventus FC in 2004, under Fabio Capello, his coach at Roma; he received his first Italy call-up in August.

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,[9][10][11][12][13] although he was awarded a new contract extension, which would keep him with the club until 2009.

[12][13] 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,[12][13] Blasi joined Fiorentina on a loan with an option to buy,[15] under Cesare Prandelli, who had previously also been his coach at Parma.

[23] On 7 August 2012, Blasi joined the newly promoted Serie A side Delfino Pescara 1936 on a one-year deal.

He also played for the Italy U-21 side at the 2002 UEFA European Under-21 Championship, as a starter, due to the injury of Enzo Maresca;[30] he partnered Matteo Brighi, Andrea Pirlo and Marco Marchionni in midfield, as they reached the semi-finals.

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.

Due to his technical characteristics and wide range of skills, he has also been deployed as a deep-lying playmaker in midfield, in front of the back-line, courtesy of his good feet, distribution, and ability to switch the play.