International Sports Office (ISO)
Balkan-to-Elite Bridge
Serbia €70mm
Key Facts
Also known as: ISO; International Sports Office
Founded: 2015 (Serbia)
Headquarters: Zmaj Jovina 15, 11100 Belgrade, Serbia
Players: 20+ (15+ in 1st tiers) • Total market value: €70mm
FIFA/FA registration: FIFA-licensed agents on staff — Darko Ristic (Executive Director); Dejan Grgic (licensed). Operates under FFAR and Serbian FA (FSS) rules.
Languages: Serbian; English; French
Regions covered: Balkans; Central/Eastern Europe; Italy; Israel; Austria/Germany; North America (MLS/Mexico)
Email: office@isoffice.rs
Instagram: https://www.instagram.com/isoffice.rs
Facebook: https://www.facebook.com/InternationalSportsOffice
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About
International Sports Office is a Belgrade-based football agency founded in 2015. ISO blends elite representation with pathway development, combining hands-on career planning, strong club relationships and full off-field support. The agency rose to wider prominence with the marquee Dušan Vlahović transfer in January 2022 and today manages both top-flight internationals and high-upside prospects, plus selected coaches.
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Key People
Dejan Grgić – Founder, Licensed Agent
Co-founder and licensed agent; active in football management since 2015 with a focus on identifying and supporting high-potential talent.
Contacts: office@isoffice.rs (general)
Instagram: https://www.instagram.com/darkoristicagent/Darko Ristić – Executive Director, Licensed Agent
Executive Director and licensed agent; decision maker, leads representation operations and deal execution.
Contacts: darkoristic@isoffice.rs, +381 64 9898898Borisav Djokić – Recruitment Manager and Scout
Agency-listed agent involved in player representation and client support.
Contacts: borisavdjokic@isoffice.rsOgnjen Ivanović – Agent and Scout
Involved in hands-on client work and career guidance.
Contacts: ognjenivanovic@isoffice.rsNenad Bižić – Head of Scouting
Leads scouting and recruitment, supported by an international scout structure.
Contacts: nenadbizic@isoffice.rsAdditional staff (selected)
Kristijan Djurdjević – Scout (kristijandjurdjevic@isoffice.rs)
Mario Lovrić – Scout (mariolovric@isoffice.rs)
Saša Savić – Scout (sasasavic@isoffice.rs)
Fabio Carleandro Da Silva – Scout (fabiodasilva@isoffice.rs)
Dušan Djokić – Marketing (dusandjokic@isoffice.rs)
Licensed agents (publicly listed): Darko Ristić, Dejan Grgić
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Client Roster (teams in brackets)
Top players and talents (current):
Dušan Vlahović (Juventus) – 28.01.2000
Dejan Joveljić (Sporting Kansas City) – 07.07.1999
Veljko Birmančević (Getafe - on loan from Sparta Prague) – 05.03.1998
Kristijan Belić (Maccabi Tel Aviv) – 25.03.2001
Svetozar Marković (Viktoria Plzeň) – 23.03.2000
Andrej Kostić (Partizan) – 16.06.2006
Erik Kojzek (Wolfsberger AC) – 07.03.2006
Uroš Đurđević (Atlas) – 02.03.1994
Bojan Kovačević (Cádiz) – 06.07.2004
Mateja Đorđević (Austin FC) – 09.11.2002
Jovan Šljivić (OFK Beograd) – 14.10.2005
Mateja Milovanović (Partizan) – 18.04.2004
Juwensley Onstein (Jong Genk) – 07.10.2007
Aleks Zeković (Feyenoord U21) – 16.11.2006
Đorđe Jovanović (Maccabi Haifa) – 09.10.1998
Ivan Milošavljević (AEL Limassol) – 19.03.2000
Radovan Pankov (Legia Warszawa) – 05.02.1995
Aleksa Janković (Sumgayit) – 14.09.2000
Zlatan Šehović (Dukla Prague) – 08.08.2000
Veljko Mirosavić (FK Novi Pazar) – 15.06.2005
Nikola Čolić (Borac 1926 Čačak) – 17.08.2002
Jovan Kokir (Dubočica) – 25.04.2000
Petar Grbić (Budućnost Podgorica) – 07.08.1988
Aboubakar Oumarou (Retired) – 04.01.1987
Aleks Zeković (Feyenoord U21) – 16.11.2006
Notable former clients: not publicly documented
Coaches/Staff represented (if any):
Dejan Stanković (Red Star Belgrade) – 11.09.1978
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Notable Deals
2022 — Dušan Vlahović: Fiorentina → Juventus; permanent; ~€81.6m + bonuses; contract to 2026
2025 — Dejan Joveljić: LA Galaxy → Sporting Kansas City; cash trade ($4m); Designated Player deal to 2028
2025 — Bojan Kovačević: Cádiz CF activates purchase clause from Partizan; permanent; contract to 2029
2024 — Veljko Birmančević: Toulouse (end of loan) → AC Sparta Prague; permanent; ~€2.3m; contract to 2027
2024 — Svetozar Marković: Partizan Belgrade → FC Viktoria Plzeň; permanent; three-year deal
2025 — Kristijan Belić: AZ Alkmaar → Maccabi Tel Aviv; season-long deal to 2026
Fees shown are indicative estimates (not official).
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Services
Contract negotiation; domestic & international transfers/loans; image rights and sponsorships; PR/branding and media; legal/tax liaison; relocation and family support; performance planning and long-term career strategy.
Partner Network
Representative club footprint includes Juventus, AC Sparta Prague, FC Viktoria Plzeň, Maccabi Tel Aviv, Maccabi Haifa, Cádiz CF, Legia Warszawa, Austin FC, Atlas Guadalajara, Wolfsberger AC, Red Star Belgrade, FK Partizan; allied scouts, lawyers, physios and marketing partners across Europe, Israel and North America.
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Track Record (last 3 seasons)
Total transfers completed: 8+
Deals ≥ €10m: 0 (within this period)
Clients in top-5 leagues: 2 (Serie A; LaLiga)
National team clients: Serbia (senior/youth); Montenegro; Bosnia & Herzegovina (youth)
Renewal/extension deals: not publicly highlighted
Fees shown are indicative estimates (not official).
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Approach & Philosophy
ISO is relationship-driven and scouting-led, prioritising playing time and role fit before step moves. Negotiations focus on value-protective structures (sell-ons, buy options, performance add-ons), while 360° player care — legal, financial and family support — de-risks relocations and sustains long-term development.
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Fees & Transparency
Commission ranges not publicly disclosed. Operates under FFAR and FSS regulations with written mandates; dual representation only with informed consent. Image-rights and reimbursable expenses handled case-by-case with prior approval.
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Compliance & Reputation
Disciplinary actions / sanctions: none publicly reported
Litigation / disputes: none notable in the public domain
Media sentiment: positive/neutral — anchored by the Vlahović deal and steady top-flight placements
