No idea why but I think that any country that’s east of, and including, Austria/Czech/Croatia etc tends to “make” good keepers. That’s not to say that those countries always make the very best keepers but the ratio of good keepers to good outfield players seems to be higher in those countries than in countries west of that area.
I know I get a lot of stick for “only” liking European players but I do think we’ve had our fair share of average British keepers and none have been great. The Eastern European countries do tend to produce great keepers and that’s personally where I’d be looking at. Although at this stage I’m not bothered where they’re from, we just need a quality keeper that’s not jumping up from league 1 or is a cast off from Sunderland etc.