Celtic have decided to appeal Hyunjun Yang’s red card received during the 2-0 defeat to Heart of Midlothian at Tynecastle yesterday. The South Korea international was sent off for a high boot on Alex Cochrane inside 16 minutes despite Don Robertson initially issuing a booking for the challenge. Nevertheless, VAR intervened, and Yang was given his marching orders on a day fraught with controversy surrounding the officiating on display. Just before the interval, Tomoki Iwata was penalised for a handball despite not facing the play that eventually gifted the home side an opportunity to open the s…