Seems a lot of current top professional players who're approaching the end of their careers are taking this route. I read that a number of them are doing so but I can only remember Leroy Sane of Bayern, ex Citeh, as being one. Sought after things are fairly recent PL experience, a good catchment area, some tradition, decent support and a playing identity. Apparently Swans were identified as a good bet by meeting all those criteria.