This weekend is the most important of the season so far in determining the title.

Sunday features the highly anticipated match between league leaders Leicester City and Arsenal, who sit five points adrift of the Foxes. The first time these two teams met in September, Leicester, then not seen as a serious title contender, were spanked 5-2 at home by the Gunners.

Many thought  the then fourth placed Foxes would slide down the table into their usual positioning. However, Claudio Ranieri’s side has only improved and now sit atop the table.

A win for Arsenal would put Arsene Wenger’s just two points off the top, while a loss would see the Gunners eight points behind the Foxes. It’s clear that this could be considered a must win for both teams.

Here are five things you need to know ahead of this weekend’s Valentine’s Day clash at the Emirates...

Leicester City can't contain Alexis Sanchez

Arsenal v Southampton - Capital One Cup Third Round

Alexis Sanchez has scored four goals in his three Premier League games against Leicester City, including a hat-trick against the Foxes in Arsenal's 5-2 win at Leicester.

Walcott should be in Arsenal's XI this weekend

Theo Walcott

Theo Walcott has scored in both of his Premier League appearances against Leicester City.

We could be in for a high scoring affair

Riyad Mahrez

Three of the four players to have had a hand in 20+ goals in the Premier League this season will play in this match, Riyad Mahrez, 24, Jamie Vardy, 21 and Mesut Ozil, 20.

Historically, Arsenal has dominated this matchup

Leicester City v Arsenal - Barclays Premier League

The Gunners have won 12 and lost none of the last 18 Premier League matches against the Foxes, and have won their last eight home matches against Leicester.

Arsenal haven't played well against top-of-the-table teams

Premier League - Manchester United 1-0 Arsenal

On the last 11 occasions that Arsenal have faced a team that were top of the Premier League, they have won just once. During those games, the Gunners have drawn four, lost six and scored only four goals and conceding 18.