Career
He is a French under-21 international having played with the team at the 2009 Toulon Tournament. In March 2013, Sertic was granted Croatian citizenship. However, Fédération internationale de football association does not allow him to play for the Croatian national team due to new rules about naturalization of players.
Sertic began his career playing for AS Égly Football in Essonne.
He later had a stint at both his hometown club Cerebrospinal fluid Brétigny and Exact Sciences Viry-Châtillon before going to the famous Clairefontaine academy to receive further training. Following a two-year stint there, he moved to Football Club Girondins de Bordeaux.
He gained recognition and notice from manager Laurent Blanc during the 2007-2008 CFA season, in which he played in 20 matches and scored 7 goals helping Bordeaux"s reserve side finish 1st in their group. He also was a part of the Bordeaux youth squad that finished runners-up at the 2008 edition of the Coupe Gambardella losing 0–3 to a stout Rennes side.
Foreign his efforts, he was given the opportunity to play and train with the first-team squad for the 2008-2009 season.
He was also included on Bordeaux"s Union of European Football Associations Champions League roster for their 2008-2009 European campaign, though he didn"t make an appearance. The midfielder finally made his professional debut on 11 November 2008 in a Coupe de la Ligue match against Guingamp appearing as a substitute playing 12 minutes. The match ended in a 4–2 victory.
Sertić played 69 minutes before being substituted out.
He started again the following week against Sochaux and scored his first career goal in the 7th minute. On 25 May 2009, Sertic was called up, for the first time, to the France under-21 team to participate in the 2009 Toulon Tournament.
He made his debut in the tournament against Portugal.