The North London club reclaimed top spot in the Premier League with a 2-1 win over Brighton at the Emirates.
It wasn’t all good news for Arsenal, however, with Jurrien Timber picking up an injury on Friday and Riccardo Calafiori being replaced by Myles Lewis-Skelly just minutes before kick-off.
“Jurrien landed awkwardly and there's something with Richy (Calafiori),” he said.
“It’s very, very strange but you speak to Declan and tell him he needs to play as a right wing (back), and he said, ‘Okay, I'm up for a challenge, I'm going to do my best’.
“The attitude is great to witness.”
Arteta added: “We were a big threat, so very pleased with all of that, but the margin should have been much bigger.
“I mean the amount of situations, chances, open chances that we generated through the game, it should never be 2-1, but that's the Premier League.
“I think the first shot that they had, they scored the goal and then David (Raya) has to make another save to maintain the result.
“We have a lot of issues (with injuries), and we're dealing with it in an incredible way. Declan has to play as a full back and you see the performance that he put in, so that's the spirit and that's how much our players want it.”