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.