So far, its just a single slot left and that is, the 4th place and Arsenal is more than capable to take over that slot. They've been more impressive compared with the 3 other teams in the likes of Manchester United that now occupies the spot, West Ham United and Tottenham. Its not going to be an easy game at all as all four teams knows the value of this spot and with Arsenal now solely focused on the EPL haven't been eliminated from other leagues, they should do even more better.
With there Chelsea fixture being postponed, they should have better luck with Brentford to better position themselves on the league. Hopefully, they won't overrated themselves and be surprised by Brentford.
Maybe not, I think Tottenham are much more deserving of that place than Arsenal. You cannot expect Arsenal to secure 4th place this season when other teams like Tottenham, Manchester United, West Ham and Wolves still have chances to win more match. It's true that Arsenal are now better, but they haven't been able to win many match against top teams.
We know the Premier League is not finished because there are still many match that have not been played, this will provide an opportunity for several teams to secure 1 Champions League ticket next season including Arsenal.