You're right in that he played the second half of a warm up game against Parana Clube at left back, but he's very left footed, so can play as cover for Davidson if required.
You're right about centre backs playing on the right. Given the circumstances I think McGowan has done ok the past game & a half but agree that long term he isn't the obvious option there. Of course, Franjic has to find games & fitness.
As to the alternatives for Spain, I know that Milligan was being mentioned as a right back option for this one before his hammy, & there's talk he msy be back for Spain, so it's an option.
But I wouldn't be surprised if McGowan gets another crack. As I said, thought he did ok, and I remember being impressed by him as a right back for Hearts against Liverpool in a Europa league game a couple of years ago.
Meanwhile, he provided a gem of an assist (first time ball) for the Cahill goal...
Bozanic left footed Fuss, so he's unlikely to play right back, but I'd like to see him start in mid, or at least 45 off the bench
The thought crossed my mind writing this, but didn't want to say it too loud (fear of losing him) ;)