This thread is probably a tad premature, as I think much of the concern about McGrath has been related to his ability to get through the series - and he does have a bit of an ankle concern at the moment.
On that, did anybody notice all the Nine commentators talking about Giles' selection in this match as being "vindicated" after Marto expertly guided one of his early deliveries into the slips at comfortably catchable height? Good call, fellas.
Having said this though, I didn't lose the faith. Picked McGrath as biggest wicket-taker of the series in fact. I'm hoping the injury is as minor as it's being reported to be, though.