I don't think, Arsenal will experience any challenges they experienced last season that made them not to lift any title through out the season because of the poor performance. I believe Arsenal coach will do everything possible in this summer to work on some of their players to ensure they maintain a good stand in this season to bring progress to the team. If Arsenal strikers can demonstrate what they displayed to defeated their opponent 5-3 in their pre-season match few days ago, show that they will not allow any team to disgrace them in the UEFA champions league competition because they have what it takes to embrace the title in this season.
After few years we have Arsenal in better shape with as they are working in transfer window for the strength of their team look like now they are having fair chance for the better result and their new recruited players can bring better results which will help them for having another challenging year in Premier League and in Champions League most chances they will be not had any problem for the having spot into knockout round because they are strong team which is capable of having better results against opponents.
With most chances their main target could be to have fight hard for the title in Premier League because in last season they lost this in last few rounds, but this time things are looking much better, and they can do good to challenge for the titleholder as well.
Actually, every season Arsenal is always active in the transfer market to get the players they want to strengthen the performance of this club.
But it just that sometimes in every season there are problems such as decreased reserves causing Arsenal to be unable to get the players they want and for this season Arteta is trying to be more active to get some young players who will be recruited as starters this season and Arteta is currently on the situation is very excited to beat the rival club Manchstr city to be able to get the champions league trophy like the rival club.
I am pretty sure this season Arsenal has had tremendous improvements and not only in the premier league, of course in the champions league they will always perform well and Arteta as a coach will maintain the stability of his players not to get injured.
Because if the player you rely on is injured or another player is injured, it will certainly reduce the club performance so that the Arsenal coach task is also a bit heavy.