Mikel Arteta has reiterated the message that his side are only at 'half-time' heading into the return leg at the Parc des Princes next Wednesday.
Ousmane Dembele's goal inside the first five minutes turned out to be the decisive goal in the first leg, although the visitors were maybe unfortunate not to have had more on the scoresheet.
Repeating the same words that he used after their impressive 3-0 win against Real Madrid in the quarter-final, Arteta ensured fans that they have more to give in their quest to win the Champions League.
"We're at half-time. Half-time and my message is exactly the same. How it was against Real Madrid at home 3-0. We have to go to Paris and win the game. We are more than capable of doing it,
"I saw two very good teams, but the margins are so small. They had efficiency in front of the goal. The keeper also made a difference to see the result that we've seen tonight."
Arteta admitted that his set-up made it difficult for his side in the first 30 minutes, with PSG enjoying a lot of the ball and the bulk of the chances.
"We had especially one issue that we corrected after 15-20 minutes. We sustained that for the rest of the game, which I think turned the game around. If you want to win the Champions League final, you have to do something special. We're going to have to do something special in Paris to be there," he said.
Arteta reflected on the opportunities that the Gunners had to derrail PSG, including Gabriel Martinelli and Leandro Trossard's one-on-one opportunities that were superbly saved by Gianluigi Donnarumma.
"At the end, we have two of our front players, 1v1 with Donnarumma. If they scored the goal it is different. He made the saves, like he did against Liverpool and Villa, and that's the difference in the Champions League. The margin is so small. We had a bizarre goal as well and another two big situations that happened in the game that didn't go, unfortunately, our way."
PSG's prolificacy has been a key talking point in their win over Aston Villa and although they wasted some golden opportunities, Dembele's strike has given the Gunners a burden that they will have to overcome.
"There are always things to improve, but when you win, especially the result, especially the efficiency in the areas, because the margins are very small," he repeated.
"They are two teams where you can see that everything is in a thread and each action can go from one side or the other. And it has to be on your side.
"We will surely make some adjustments, and depending on the context of the game, we will make more adjustments. And from there, we will go with a lot of enthusiasm, with a lot of desire and with the feeling that we can do it."
When asked about what his side could change ahead of the second leg, Arteta responded: "I think the margins were so small, so I don't think so. But if it's significantly better, hopefully, the result will be significantly different as well."
Arsenal face Bournemouth at the Emirates on Saturday before they make the short trip to Paris next week.
