His team had to try to lock games down better than they had been.
Since the beginning of the match, the game was full of excitement with attack and counter attack.
The strike was the midfielder's first goal in 43 Premier League matches, with his last against West Brom in May 2015.
But Bellerin was determined not to end the night as the fall guy and the wing-back pounced on Alonso's weak header to crash in the equaliser.
Marcos Alonso then made it 2-1 for the visitors six minutes from time, with the Spanish defender flicking home Davide Zappacosta's sweet cross - although not for the first time this season, Arsenal's defence looked amateurish. Here's how the Arsenal players fared in the stalemate. Petr Cech made a number of hugely impressive saves over the course of the night and was unfortunate to concede in the manner he did. Alvaro Morata was left with a very clear one-on-one opportunity after a mixup between the Englishman and Shkodran Mustafi but Morata put it well wide of the target.
In 63rd minutes, the goal was finally be seen. He needs to improve on his defending skills though as his unnecessary challenge on Hazard inside the box lead to a penalty and a shift in momentum.
And Wenger was swift to raise the stakes again after the draw with top-four rivals Chelsea, saying the penalty count against Arsenal was "not coincidence".
After a slow start, this game really opened up in the first-half.
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However, Arsenal already have young centre-back duo Calum Chambers and Rob Holding, while highly rated Krystian Bielik is spending this season on loan at Birmingham.
Tiemoue Bakayoko - 5 - Lost in midfield, unable to track the runs of Ozil throughout the game. The Spaniard didn't play particularly well but popped up with a wonderful equalising goal late on.
"This is not a lucky period for him (Morata)". Plays such intelligent passes and so good when at his best only to turn around and be unable to make a simple 4 yard pass. Playing as a left wing-back in place of the injured Sead Kolasinac, he dominated Moses on the left-hand side.
There was one more twist in the tale, however, when Zappacosta crashed a long-range shot against the bar. This performance would be a huge confidence booster for the young lad. Xhaka gives Arsenal some balance and discipline in that midfield, with the idea of a Wilshere-Ramsey midfield duo seeming deadly going forwards, the results at the other end of the pitch would be shocking.
Whereas Chelsea fans see it as a clearcut foul.
"Knowing he was on a yellow card, he was stupid to dive over Andreas Christensen in the second half". He needs to be consistent enough if he has to be included in the England squad for the World Cup.
That proved to be the final chance of the half as the two sides settled for a share of the spoils.