[7] Masi made his professional and European debut on 10 December 2008, replacing Riccardo Montolivo in the last minute.

That season he played 15 times[9] in the youth league group stage, shared the role with Andrea Bagnai.

[13] In July 2011 he left for Serie B club Bari in co-ownership deal for a peppercorn of €500.

[27] However, he did not enter the squad for 2009 UEFA European Under-19 Football Championship qualification in Moldova.

[29] After the injury, he returned to the feeder team of U-21 in March 2011, for 2010–11 Four Nations Tournament, but again did not play.

Instead, he received a call-up from Italy under-21 Serie B representative team, winning Serbian First League selection.

[32] Masi was part of Italy squad at 2013 and 2015 Summer Universiade (which he played the first and last match).