Career
Early career
Born in Johannesburg, South Africa, of Swiss descent, Untersee moved to Switzerland at a very young age and opted to represent Switzerland at various youth levels internationally. Following his move, Untersee joined the youth academy of Football Club Zürich, where he would eventually remain until 2010, before transferring to Italian giants, Juventus Football Club during the 2010-2011 season. Juventus
On 28 October 2010, Unterseeo officially left Football Club Zürich to join Juventus, where he was assigned to the youth team
After a successful debut season in Italy, Untersee was called up to the first team training camp in the summer 2011 by new head coach Antonio Conte.
Following the summer ritiro, however, the young fullback returned to the youth sector for the 2011-2012 season and remained during the 2012-2013 campaign as well. On 1 January 2014, Juventus confirmed that Untersee had left them for Football Club Vaduz on a six-month loan deal that would expire on 30 June 2014.
Instantly making an impact with his new team, Untersee made his first appearance against Football Club Lugano in a 2–0 home victory on 3 February 2014. He went on to make 15 league appearances.
Additionally, he scored his first goal for his new club in an 8–0 victory over Football Club Ruggell in the Liechtenstein Football Cup.
On 3 July 2014, Juventus and Vaduz reached an agreement to prolong the loan deal for another season.