Since Muslims cross ethnic backgrounds, I don't see it would be an issue. You are more likely to see problems with small and/or remote villages that "stick to their own kind" where you may see more distant cousin/distant relative marriage.
Some small-island Greeks have issues like this likely also caused by small gene pool.
I recall reading, many years ago, about a group of Americans who also suffered from some genetic disorder. It was traced to one village in Portugal.