Twenty-one-year-old FC Tokyo captain Kuryu Matsuki is preparing for a move overseas, his J-League first-division club said Saturday. According to a source with knowledge of the matter, the midfielder will likely move to English Premier League side Southampton and be loaned out to Turkish Super Lig club Goztepe, while an offer from Germany is also possible. Matsuki had been a regular member of Japan’s under-23 team but was left off the Paris Olympics squad. A winner of Japan’s national high school championship, he made an instant impact on both attack and defense in his 2022 J-League debut seas…