Alexander Lacazette first goal levelled things up after Sadio Mane gave the visitors the lead.
Here is what Arteta said after the game;
Arsenal boss Mikel Arteta: "Absolutely, in terms of energy and happiness in the dressing room before the semi-final, it's a good medicine.
To beat this team you have to have moments in the game when you take your chances, defend and have a bit of luck.
"I was worried after 1-0 how we would react. We were able to pick one moment and believe again.
"We will go for both, our maximum, it is just a few games so we will keep going. The gap between the two teams today is enormous, we can not improve it in two months, but the accountability, the fight is now equal and I am very proud of that. The rest will take some time.
"Arsene (Wenger) did some incredible things and was very successful. I have done nothing yet. We need belief to go in the direction."
On finances: "A big concern, you need quality, quality players and a big squad to compete in these competitions. It is a challenge."
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