Gajić was the number 39 pick in the 2004 NLL draft by the San Jose Stealth.
He then became a free agent and sat out for two seasons to pursue a hockey career at University of Nebraska-Omaha.
Gajic missed the entire 2009 Mann Cup finalist campaign due to injury.
In October 2009, Ilija was acquired by the Mammoth in a trade with Rochester in exchange for forward Gavin Prout.
[2] A fourth brother, Milan, is a professional ice hockey player currently playing for the Victoria Salmon Kings of the ECHL.