Ex-Rangers defender Lewis Mayo has had a red card appeal thrown out by the SFA on a day dominated by headlines surrounding Celtic winger Yang Hyun-jun. The 23-year-old Killie centre-back was sent off for a last-man tussle with Dundee forward Scott Tiffoney which led to a penalty for the Dens Park side at the weekend. Whilst the match ended 2-2, Kilmarnock boss Derek McInnes was aggrieved at full-time that the VAR team didn’t send the referee to the monitor to review the decision. After appealing the decision, Lewis Mayo has had the red card upheld and will now miss Kilmarnock’s next league gam…