Arsenal assistant manager Albert Stuivenberg conceded there was great frustration after defeat at home to Manchester City.
City won 2-1 with Rodri netting the winner on 93 minutes.
Stuivenberg later said, "We are very frustrated with the outcome if you play a game like this against one of the best teams in the world. At the end to have zero points is frustrating because we should have won the game."
On Arsenal not being given a penalty, he added: "I think it is a penalty but I am looking for consistency. We have VAR in place so why not check yourself as a referee? That did not happen so it is disappointing.
"We did really, really good, how many chances did they really create? Until the end, they have lucky chance when it drops to them. The fans enjoyed our performance today, we had our chances, we had the big one at 1-1 with Gabriel Martinelli, it did not go our way but proud of the performance."
On Gabriel's red card, Stuivenberg concluded: "It is something we have to learn, we have young players in the team and have to control our emotions. I am not sure the first yellow is because of that (scuffing the penalty spot), I cannot ask the question to the referee now. If you are on a yellow you have to be smarter."
"A lot of positives and we have to build from here, this is the level we have to play. Everyday we work hard to create this situation. We want to see a team with belief and can compete with a team like this and can play against a team like this too. We showed all of that today."
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