Liverpool's biggest threat is Manchester City and I don't see Arsenal having much of a chance. Arsenal's mentality has always been broken in the last 10 matches and if they lose then it will continue to follow. I am not optimistic about Arsenal because the previous season was much more likely but in the end they were eliminated from the title race.
I don't have any confident on arsenal because is obvious that there late poor performance that happen to them last season has obviously follow them back to this season, so there is no way we can expect more from Arsenal because they are already not so good in there performance irrespective of there previous winings lately, they no longer have chance on the premier League champion this season although they were able to manage and secure the same point as Manchester City but they can never outperform Manchester City this period, so perhaps the only biggest challenge of Liverpool right now is Manchester City because with the way Manchester City is following them on the premier League table if they make a mistake by losing just two matches Manchester City will take over the premier League table.