Arsenal boss Mikel Arteta concedes this season could be their last best chance to win the Premier League.
Manchester City are again ahead of second place Arsenal after victory over Leeds.
Arteta said: I don't know. They have performed really well this season and they deserve to be where they are.
We have done the same. But next season will be something completely different in my opinion.
From my experience 22 years here this has been the most difficult league that I have participated in.
Next season looks like it is going to be even harder. But this one, with four games to go, I'm telling you, it's the hardest I have ever been involved in.
It is the best time because this is the moment right now.
The best time is when you have something and try to take it, because you don't know when you are going to have another opportunity. That's what we are trying to do.
We are going to Newcastle to try to win and continue to be there."