Celtic are their own worst enemies yet again after Adam Idah missed a penalty just minutes before Yang was shown a red card. The Scottish Champions were handed a chance to go ahead from the spot when Cochrane hauled Yang down.
The Irishman, who has been brilliant since arriving from Norwich, scuffed his penalty and it allowed Zander Clark to save with his legs.
It was Yang and Cochrane again that clashed on the touchline. The South Korean winger attempted to control the bouncing ball, which led to his foot catching Cochrane in the head. Robertson initially have a yellow but John Beaton at Clydesdale House instructed his colleague to have a look.
Once over at the monitor it didn’t take long for Robertson to overturn his initial decision. Yang was given his marching orders and now Celtic need to dig deep to take all three points and take advantage of the result at Ibrox yesterday.