Alexis Sanchez says Arsenal must win the clash against Manchester United when they visit Old Trafford on Sunday (28 February). He has made it clear that the three points are imperative if the Gunners want to sustain their Premier League title challenge.

The north London club are in the third place, five points behind league leaders Leicester City with a game in hand as they search for their first title in over a decade. Apart from the Foxes, second-placed Tottenham and fourth- placed Manchester City are also in the mix for the top prize in English football. United, on the other hand, are hoping to finish in the top four and a victory will help them close the gap on the club's ahead of them.

The Chile international acknowledges the difficulty of facing the 20-time English champions at Old Trafford, but has hinted that the team has prioritised the Premier League and are keen to win it this season. Sanchez is yet to hit top form this season scoring just six goals thus far this campaign, after a stellar debut campaign in the league.

"We are obliged to win this match to put ourselves into a position where we can fight hard for the title," Sanchez said, as quoted by the Mirror.

"Manchester United are a very strong team with a great history of football. They have all this history behind them and it's going to be a hard match."

"Now the focus is on the Premier League and trying to win – that's important for me, the team, for everyone. I'm very happy here."

Arsene Wenger's team recorded a thumping 3-0 victory in the corresponding fixture earlier in the season at the Emirates Stadium with Sanchez scoring twice, either side of Mesut Ozil's goal. The former Barcelona star revealed the reason behind what he labelled the 'best match' of the season until now.

"That really was the best match we've played all season. We went out there and put pressure on them having gone out with the mentality to win."

"That day, before we all went out for the match, if you looked into the eyes of all the players you could see we all had this hunger to win," the Chilean added.

"There was just a look on our faces that we wanted it and, when you have that, you know you're going to be hard to beat and that's what happened – we went out with that mentality."