The 25-year old centre-back has signed with last season's runners-up just 11 days out from the new campaign after leaving Qatari outfit Al-Arabi earlier this year.
The Geelong-born former FC Nurnberg and Urawa Reds man will provide competition in the Wanderers defence which already consists of Michael Beauchamp and Nikolai Topor-Stanley.
Spiranovic recently trained with former club Melbourne Victory as well as undergoing a couple of trials in Europe.
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