Wouldn't have a clue and he wasn't among the top 10 earners, however he must be on more than he'd be getting in the A-League otherwise I doubt he would've moved in the first place.
Also, there have been numerous transfer rumors about him as other big SA teams tried to snap him so surely he's in line to make even more money soon - and given his age, he'll probably want to make the most of if before it's too late.
This might give a glimpse into what kind of offers he is receiving (although we don't know what his current salary is)
“But we aren’t going to be bulldozed, not by Jeremy and not by any other football club. I could hand in a request to my bosses today for a 200 percent increase in my salary and they will send me out of the door. But I still have to go to work tomorrow and be a professional"
Link