Career
Ploj started his career at a local football club Jarenina and played there until 2007, when his talent was spotted by top Slovenian club He joined their football academy and at the start of 2011 he signed his first professional contract with the club He made his debut in the Slovenian PrvaLiga on 16 March 2011 against Nafta Lendava.
During that season he made another league appearance for the club, in the final round of the 2010-2011 Slovenian PrvaLiga season against Domžale, when he also scored his first goal in the top division.
During the 2011-2012 season Ploj played, on loan, for Slovenian Second League club He scored his first hattrick in the second division on 28 August 2011.
Ploj is a native of Lenart, a small town in the northeastern Slovenia.