Arsenal's target to win the group stage but there are some strong clubs like lens and sevilla. I remember when people called that these clubs as weak clubs in this group but they forgot that if lens and sevilla did have great performance last season.
Lens is always having good history against arsenal but im still doubting sevilla at this moment. It's caused by sevilla never got excellent result against arsenal. There are still 4 match days remaining at this moment.
Arsenal can still win the group stage as long as the club is solving the problems against lens.
With Arsenal success in beating Man City in the EPL, Arteta squad should be able to sweep the remaining four matches with a win. Regarding Lens, I think Arteta squad will take revenge in the next meeting, and ensure they advance to the last 16 as Group B winners. However, if Arsenal fails to do so, I think there is something wrong with their mentality in the UCL.
On the other hand, I don't think Sevilla or PSV can make Arsenal move difficult, although the possibility still exists but I think it is very small. On paper Arsenal can qualify with Lens from group B, and Sevilla has the potential to finish in third place. I think Sevilla has the opportunity to return to the Europa League, because that is where they are considered the kings.
I think Arsenal have had a pretty impressive period in the domestic league this season. In the Champions League, Arsenal have 4 remaining matches which they can use to improve their performance. Arsenal will face Sevilla next week, where arsenal will probably be focused enough to get 3 points in order to take the top position from Lens. But if Lens manages to secure full points against PSV, maybe arsenal will need to work hard when they meet Lens in the second leg.
I'm not worried about Arsenal performance in the Champions League because they are quite the favorites to qualify for the last 16. However, they have to fight hard if they want to qualify as group winners. Sevilla will try to break arsenal spirit in next week's match if they manage to beat arsenal. But if arsenal wins the match it could be that the competition will be more interesting in the upcoming match because arsenal and Lens will both be fighting to become group winners.