Arsenal boss Unai Emery was pleased with the full debuts of Lucas Torreira and Bernd Leno for their Europa League win Vorskla.
German goalkeeper Leno conceded twice on the night in his first appearance for the Gunners.
Emery said, "Well, Lucas is playing with his progress on the team and on our ideas, our performance with a passion and with a performance. Each minute he is playing, he is doing very well.
"And for Leno it's the first match also. I think that we conceded two goals but not for a mistake [from him]. For him, it takes minutes for the game and confidence for continuing also because he will be continuing to play matches in the next week."
On midfielder Torreira's performance, Emery continued: "Each match we play, I am responsible for the group and for Torreira also, today I think it is better [for Lucas] to leave the match. I hope that tomorrow and Saturday, he will be okay for Sunday."