Let's get over with this now! Arsenal has no chance of winning the Champions League. That'll be considered an expensive joke. They should focus on winning the Premier League this season and not prioritizing a competition they know quite well they can't win.
They've had a remarkable season last season, so I expect them to use that energy and motivation towards getting the Premier League job done.
The issue with Arsenal isn't that they can’t win the Champions League or the Premier League, but if they focus on winning the two, they will fail to win any. Their performance has been consistent from last season to this season, and I have high hopes for them to win a trophy this season. They have the squad to win a title this season, but they must focus and decide which trophy they truly want now. Perhaps by next season, when they have a greater squad depth, they will battle for two or more titles.
I didn't expect them to drop points off against Lens though, they shouldn't have lost that game. They should be very focused when they face Sevilla ahead. Sevilla now has a new coach, so they should expect something different and tough.
Arsenal was a better team than Lens, but I'm not sure what happened to cause them to lose to Lens. Their forthcoming game against Sevilla will not be as easy for them to win because Sevilla is a stronger team than Lens as well, and Arsenal will need to put in more effort in this match to win. Sevilla has been quite good in European competitions, as evidenced by their prior record in the competition over the years. The game will be played at Sevilla's stadium, and their head-to-head record is even.