The core of Sydney FC's squad is reeling from the tragic loss of one of the most successful and respected player agents after 37-year-old Dragan Jevtic passed away due to a stroke on Friday night.

What is a big loss for Australian football became an even heftier blow for Sydney FC as morale threatens to worsen following the tragic news of the agent of six of their senior players, including all five of their visa players.

Tough time: Sydney FC duo Shane Smeltz and Filip Holosko played with heavy hearts against Central Coast on Saturday. Credit:Getty Images

The man who brought Filip Holosko, Milos Ninkovic, Mickael Tavares, Jacques Faty, Shane Smeltz and Milos Dimitrijevic to this season's squad was widely regarded as one of the best agents in the A-League due to his record of bringing quality foreign players to the competition.

The Serbian-born agent was responsible for the signings of all players from his native country in recent years such former Sydney FC players Ranko Despotovic, Nikola Petkovic, Perth Glory's Nebojsa Marinkovic and Jets' pair Milos Trifunovic and Enver Alivodic.