The A-League likes (may actually require) clubs to announce a match-day squad for that weekend on the Wednesday or Thursday. It looks like Vukovic can't even get here until next week, and if he doesn't sign we'd just be getting McMaster anyway (I don't think anyone is that keen on putting Gould out on the park), so signing McMaster as injury cover has a very real point.
The A-League likes (may actually require) clubs to announce a match-day squad for that weekend on the Wednesday or Thursday. It looks like Vukovic can't even get here until next week, and if he doesn't sign we'd just be getting McMaster anyway (I don't think anyone is that keen on putting Gould out on the park), so signing McMaster as injury cover has a very real point.