Gray has said he just went off as a precaution to not cause damage.
I can't see anything in defence changing unless Albert can't do another 90 and Kakay comes in, but it is more likely he comes on as a sub.
I agree that we may see Ball, maybe replacing Gray if he doesn't make it to solidify the midfield with Johansen moved further forward.
Lots of talk from the club about Chair & Gray not being fit enough to start, so they will not be travelling for international games, but that perhaps takes them out of the equation? Assuming DeWijs is unavailable (as well as McCallum of course):