It's hard to believe if that Sevilla was able to beat Arsenal in the Champions League match because Sevilla performance in La Liga was less than optimal and different from Arsenal, who performed amazingly in the Premier League and managed to second.
Even though Arsenal experienced defeat against Lens, I think Mikel Arteta will learn from this mistake and try to improve the club condition to be able to perform optimally in the Champions League match.
After Arsenal managed to beat Manchester City in the Premier League, I am more confident that Arsenal will be able to get points from Sevilla in the next match, and I can confirm that Arsenal will be able to qualify for the next round in the Champions League.
The next match is an opportunity for both teams to be the best and get full points in order to be in a better position in the group standings. But there is also truth in what you say, where Mikel Arteta will continue to provide better encouragement to his team so that they can win at Sevilla's home ground later. Because Arsenal also has greater self-confidence after being able to beat the best team in the Premier League in recent times, Arsenal will try to perform as hard as possible to achieve victory in the next match in the Champions League.
Arsenal chances of getting points at home to Sevilla are quite big, because they are in good form and have a better mentality. Of course the match will be very tough, because both teams are setting targets to improve their position in the standings. Arteta and his squad must forget about the defeat against Lens, and focus on chasing points in the next match. In terms of readiness, Arsenal is superior in all aspects to Sevilla.
I can't imagine if Arsenal lose points again when facing Sevilla, it will make things more difficult for them to qualify. However, I still believe that Arteta can get Arsenal into the last 16, because Arsenal is considered lucky to be in group B, Arteta it has better squad depth than Sevilla, Lens and PSV.