It has been confirmed that Celtic won’t be without Hyunjun Yang for much of April, despite being called up by the Korea FA for an upcoming tournament. Yang was named in the South Korean squad for the AFC U23 Asian Cup in Qatar, which also serves as a qualifier for this summer’s Olympic games in Paris. However, Celtic have informed the Koreans that they have declined to release the winger and he won’t be travelling with his compatriots to a training camp in Dubai this week. This is within Celtic’s capabilities as the U23 tournament falls out with the FIFA international match calendar, meaning t…