After it was previously noticed that Costas Philippou had been removed from the UFC rankings, it has been confirmed that he's retired from the sport.
Earlier on Tuesday it was noticed that Costas Philippou was removed from the UFC rankings, having previously been ranked 12th in the middleweight division. Normally that's an indication of an expired contract, failed drug test, being released outright, or retirement. The brief bit of speculation has come to an end, as UFC VP of Public Relations Dave Sholler confirmed that Philippou has decided to hang up the gloves.
@mookiealexander he has indicated to UFC that he has retired.