Career
Born in Šempeter pri Gorici, he spent his childhood in Nova Gorica, Slovenia. Birsa"s career began at the age of five, when he started playing for North Dakota Bilje, the village club of Bilje near Nova Gorica. As he was a talented player, he was soon transferred first to Primorje, then to Gorica at the age of 17.
By the second season he was already the second best striker and one of the best in the Slovenian first league, scoring 29 goals for his home team, an outstanding goalscoring record for a midfielder.
Sochaux
In 2006, he signed for French club Sochaux in Ligue de Football Professionnel, Ligue 1. He was declared the best Slovenian player of 2006–2008 by the leading Slovenian football website.
= Auxerre (on loan) On 22 January 2009, AJ Auxerre signed him on a loan deal until June 2009 from Sochaux. He scored his first Auxerre goal against giants Lyon.
On 29 May, it was announced that Auxerre had made the loan permanent.
Genoa
On 2 February 2011, despite interest from big Premier league teams such as Liverpool and Fulham, Birsa signed a four-year contract with Serie A club Genoa. He made just nine appearances in his maiden season in Italy. = Torino (on loan) He joined Torino on the 31 August 2012 on loan.
At Torino, Birsa played 17 games, scoring 2 goals but did not do enough to convince Torino to sign him on a permanent deal so he returned to Genoa at the end of the season.
Air Corps Milan
Birsa made the switch to Milan on 31 August 2013, in what was a straight swap deal which saw Luca Antonini move in the opposite direction. He was handed the number 14 shirt at Milan.
Chievo
He signed for Chievo on 9 July 2014 on loan. On 2 July 2015, Chievo signed Birsa outright in a three-year contract.
He also plays for the Slovenian national football team, and was the youngest player to have that honor at the age of 18.
At the 2010 World Cup finals, Birsa struck a long-range curling shot in Slovenia"s 2nd match against the United States. Slovenia drew that match 2–2.