Nikola "Nik" Mrdja is an Australian former football player, who played as a striker. Born in Perth, Mrdja had a career spanning several National Soccer League and A-League clubs from 1998 to 2011, as well as a brief spell in Sweden with AIK in 2004. Mrdja made one appearance for Australia, in a friendly against Argentina in 2007. Mrdja no longer plays professionally. The West Australian newspaper, on 24th April 2019, reported that the ex-A-League frontman told Fremantle Magistrates Court he will plead not guilty to offences, which include 10 counts of aggravated possession of a firearm, possession of methamphetamine and cannabis and three counts of possession of stolen property. Mrdja has also been charged by Western Australian Police with two counts of possession of a silencer, possession of drug paraphernalia, being an unlicensed person in possession of a firearm or ammunition, cultivating a prohibited plant and receiving.
In December 2004, Mrdja signed with Central Coast Mariners to play in the newly formed A-League. In the Mariners first competitive fixture, an F3 Derby against the Newcastle Jets in qualification for the 2005 OFC Club Championship, Mrdja broke opposing defender Andrew Durante's leg with a tackle late in extra time. The incident subsequently gained prominence as a sparking point for the clubs' rivalry. On the field, Mrdja's early form for the Mariners was strong. In the club's next game against Adelaide United, Mrdja scored a hat-trick, sealing progress to the qualification final. He scored another hat-trick in a 2005 A-League Pre-Season Challenge Cup win over Queensland Roar. However, soon after Mrdja suffered a knee injury causing him to miss the entire 2005–06 A-League season, eventually returning early in the 2006–07 season. His first goal in the A-League came from a direct free kick in a win over New Zealand Knights on 19 November 2006. Mrdja's knee injury continued to be an issue, and saw him miss much of the 2006–07 and 2007–08 seasons.
In February 2010, with the Mariners out of contention for the 2009–10 A-League finals, Mrdja was released by the Mariners and signed a short-term deal with Melbourne Victory to play in the final rounds of the A-League and in the 2010 AFC Champions League, as an injury replacement for Billy Celeski. At the same time, he signed a deal to play for the Mariners again in the 2010–11 season. The unusual nature of the move, despite being valid within the rules, created significant controversy, given its lateness in the season and the ban on direct loans between A-League clubs. The issue, and subsequent public controversy, prompted a review of the A-League's transfer rules by Football Federation Australia. Mrdja made his debut for the Victory on 5 February 2010, coming on as a halftime substitute in a win over North Queensland Fury, in the second-last round of the 2009–10 A-League regular season. He scored his first goal for the club two weeks later, in a win in the first leg of the major semifinal against Sydney FC, before being sent off later in the match for elbowing Shannon Cole. Mrdja received a two-game suspension for the incident, which eventually saw him miss the 2010 A-League Grand Final. Mrdja retired from professional football at the end of the 2010–11 season.
