Arsenal is aiming for both the Europa League and Premier League titles this year. And they will be looking to win both titles. Although it will be difficult. However, Manchester United also aims to perform well in Premier League matches to qualify for the Champions League. And so Manchester United will not be giving their full focus to the Europa League matches. I think Roma, Manchester United, and Arsenal each still have a chance to win the title.
I don't think it will be easy for Arsenal to win the Europa League and the Premier league. Already the Premier league is not easy for them because of the tough teams competing in Premier league. Arsenal interest is just winning the Premier league which for a long time they haven't been able to win it.