Arsenal saw a penalty decision overturned by VAR during their Premier League clash against Manchester United after an incident involving Kai Havertz.
The German midfielder went to ground under pressure from Aaron Wan-Bissaka and Casemiro, with referee Anthony Taylor pointing to the spot.
But replays from behind the incident were unclear as to whether there was any contact between Wan-Bissaka and Havertz.
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Taylor was subsequently sent over to the screen to check the incident for a second time - much to the dismay of Arteta on the sidelines.
And the official took a matter of seconds to look at the incident before declaring that there would be no penalty.
Arsenal supporters jeered the decision inside the Emirates Stadium, but the game continued with the scores at 1-1.
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It was a tough break for Havertz, who has had a challenging start to his Gunners career thus far.
In the first half, the German international had an opportunity to give Arsenal the lead. The ball fell to him inside the area, but he was unable to connect with the ball and the chance passed him by.
Arteta is determined to give his new number 29 consistent game time to show the Arsenal faithful what he can do, and defended the former Chelsea midfielder before the match: "If you focus on one single aspect on the demands that a player has, there are another 100 aspects of that player that he is doing so well.
"There are opinions that are to damage, and other opinions are to construct. The ones that construct are, for me, the important ones."
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Havertz was substituted by Arteta on 76 minutes, with the Gunners boss looking to add fresh legs in an attempt to find a winner over one of the club's great rivals of the Premier League era.
Topics: Mikel Arteta, Arsenal, Premier League, Kai Havertz, Manchester United