If Tottenham manage to defeat Burnley tomorrow, it would be a big pressure over Arsenal for certain. Because Tottenham will be able to capture the fourth position in that case despite its being temporary. After having that pyschological advantage, Tottenham might keep the position too. Arsenal's opponent is quite tough and there isn't any guarantee for them to beat Newcastle there. But something inside tells me that they will make it too.
Won't be a big pressure for Arsenal, even though Spurs have beaten them without conceding in the previous game, but it will trigger this Squad to perform optimally in collecting points. Newcastle have indeed been quite compact lately and the match will be held at st.james' park, but Arsenal will certainly be very confident that they can steal points from them, considering that Arsenal were able to hold off Chelsea as well.