Guessing that Ivanjica would be quite a culture shock...
Mitchell was born in NZ, and has pretty much spent most of his life here. He does have a Croatian mother as far as I know (or maybe she just has Croatian heritage, I'm not 100%). Neither country is actually in Eastern Europe, and they're actually quite different culturally. Furthermore, Ivanjica is a very small town in the backwoods of Serbia, so it's not really a place like Belgrade or Novi Sad where he could fit in relatively easily.
But other than that, yeah OK.
As a reminder see above. And my mistake the loan deal to the rural Serbian Div 1 side Ivanjica fell over.
Out of interest OFK Belgrade finished dead last, 2016-2017 season and were relegated. So his time there would have been challenging on and off the field.
Anyway good luck to him at Bolton