The 24-year-old striker joins the club after spending the first half of the 2014-15 season with Montenegrin top-flight side OFK Grbalj and scoring six times in eleven games, said a media release today.
As a full Montenegro international, Darko becomes Pune FC's marquee player and joins fellow overseas players Luciano Sabrosa and Ryuji Sueoka in the lineup.
Chirag Tanna, Pune FC Head of Operations, said, "We are very pleased to announce that we have signed Darko Nikac for the 2014-15 I-League season."
The Titograd-born striker began his professional career at FK Mladost in 2009 on a loan spell from parent club FK Buducnost. A successful loan period at the Podgorica-based club saw him return to FK Buducnost.
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During his four-year stay at FK Buducnost, Darko was an integral part of the team that clinched the league title in 2011-12 apart from finishing runners up on three occasions. Moreover, he also helped Buducnost to a cup title in 2012-13.
Having started his professional career as a 19-year-old, Darko has also represented the Under-21 national team before making his senior national team debut in 2013.
Darko thus becomes the third European player to ply his trade for Pune FC after Spanish striker Raul Fabiani (2013) and English defender Calum Angus (2013-14).