Arsenal shouldn't kill two bird's with a single stone and I disagree if they can with the same set of players the transfer window would be open soon, I do hope they can sign player's to back the once they have currently because injuries can also happen and it will cause harm in the long run. If they can they should just focus on the Premier League. Europa league will be very strong when the next season begins
I think if Arsenal can make a few more suitable signings in the January window they will have more options in different positions in the team and will be able to compete in both competitions without the fear of burning out their key players with the large number and tight schedule of games but I will also advice to focus more on the league where they already have a bigger opportunity to win it than in the Europa league.
In last few days we have updates as Arteta and Arsenal management are working on many players specially they are interested in two big players one from Brazil and second from Bayern Munich with most chances they could be able to have positive updates about this in coming winter transfer window and this is going to be big boost for them after this break because now things are going to be tough for all teams this break is going to have good changes for many teams which can bring good changes in all league tables.
Arsenal is currently at the top of the league table with not big difference, and they need to have good back up with good quality players which bring good improvement and their chances for the title also increased in this season.
@fullhdpixel even if Arsenal buy more players then too they should not bother about winning the Europa League, because this is a golden opportunity for them to win the premier league and they should not ruin it by focusing on Thursday night football. Also buying players in January is always difficult and Arsenal will have to pay a premium to land any of their targets, hence Im not expecting them to secure all their targets in January transfer window.