Celtic appeal Hyun-Jun Yang's red card and raise serious concerns regarding use of VAR
The winger was sent off for a high boot during Sunday's defeat
Celtic are appealing the red card given to Hyun-Jun Yang during Sunday's 2-0 loss at Hearts.
In a statement, the club added: "We have also written to the SFA to raise our serious concerns regarding the use of VAR and the decisions made within the match."
Yang was sent off for a high challenge in the 16th minute at Tynecastle.
The South Korean was initially yellow-carded before match referee Don Robertson upgraded it to a red after being advised by VAR John Beaton to review the incident on the pitchside monitor.
Manager Brendan Rodgers felt the defeat was "decided by the officials".
The Northern Irishman was also unhappy when Hearts were awarded a penalty in the 40th minute after a headed clearance from Liam Scales landed on Tomoki Iwata's arm as he rose to try and head it out of the box.
Jorge Grant scored the spot-kick and Lawrence Shankland netted the hosts' second goal in the 56th minute.
After the game the Northern Irishman said: "My feeling is that the game was decided by the officials, on the field and outside of the field.
"You guys (the media) will know me long enough to know that I don't really comment on officials - they make mistakes and whatever else - but today that felt like really really poor officiating.
"The first one is the sending off when there is no force. Show a still image of that and of course you will see a foot up with the head near it, but it's not the reality of the move.
"Don Robertson actually got it right on the field. It was a high boot, so it's a yellow card - no malice or force.
"For John Beaton to actually look at that in VAR, supposedly under no pressure, and say that was a sending off, I find that incredible.
"The second one (Hearts' penalty) is worse. If you have a penalty go against you for that then there will be penalties every single weekend and midweek.
"I don't know what he (Iwata) is supposed to do. Tomo is jumping, he got a nudge, he is coming down, the ball falls on to his arm and there is no intention to move.
"Then you get the penalty against and he gets the chance to look at it and see it. That really left us with an uphill task in the game but credit to my players, they kept going, their keeper has made a few good saves.
"But it was a poor day for the officials. I try to respect decisions and give the benefit of the doubt, but when I see that level of incompetence, which is the only word I can use, then that makes me worry for the game.
"In such a tight title race - which it is, and it's fantastic to be involved in - that can make the difference. And that today made the difference for us."
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