Born in Florence, Tuscany, Bagnai started his career at hometown club ACF Fiorentina.
On 11 July 2011 Bagnai was farmed to Tuscan side Carrarese in co-ownership deal for a peppercorn of €500.
[6][7] However, he did not play any game in 2011–12 Lega Pro Prima Divisione, and had a medical operation in January 2012.
[9] In January 2013 Bagnai was sold to Prato in a new co-ownership deal;[10] in June 2013 Carrarese gave up its 50% registration rights.
In 2009 FIFA U-17 World Cup, Bagnai also played once, as starting defender in the last round of the group stage.