Burton is pleased with their progress.
He told arsenal.com: "You would struggle to find someone in the team who was below par. Hector Bellerin was excellent at right back, he defended well, got forward well and his use of the ball was good. He is showing improvements in his all-round performances.
"Kristoffer Olsson in midfield was outstanding again, Conor Henderson had a good game, Sanchez Watt in the first half was always a threat and we could have scored in the early minutes off his break. So lots of positives for us."