The club requires a victory just to keep their expectations alive of concluding the Premier League's top four.
Wednesday's 2-0 win away to Southampton was the team's fourth league win in the past five games.
Sanchez moved onto 20 league goals for the season when he collected Mesut Ozil's first-time through-ball and deceived two defenders with a clever turn inside the area, before slotting home a low finish in the 60th minute.
"That's Alexis, you know". "He's always tricky to stop, very good in short space and in the box he is risky".
The second came in the closing stages as substitute Giroud made certain of the points, heading home Ramsey's nod back across the box after more good work from Sanchez.
"Overall it was a very convincing win", explained the Arsenal manager.
"Alexis always grows during the game. He's a slow starter but gets stronger and stronger". "I think we did well being patient in the first half".
"We had a few opportunities and luckily we scored two".
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"I never questioned the character of my side", said Wenger.
Now Arsenal must keep the pressure on the top four by showing the same focus and winning their three remaining matches, starting at Stoke City on Saturday.
'For me Olivier is a really good player.
Speaking to BBC Sport, Murray said: "The trouble with the amount of travel that comes with what I do is that Scottish football is unfortunately not on the TV much when I am in, say, the United States". "We went through a bad patch".
"Confidence is at a good level, Arsenal are a good side who have got back on track and have a lot of motivation which will help us make sure we're at the level we need to be to compete with them". "So let's just continue".
It's Arsenal's second win in three days, having beat Manchester United by the same scoreline on Sunday.
The 40-year-old Lauren played 159 league games for Arsenal between 2000 and 2007 and was also part of the "invincible Arsenal" side which won the 2003/2004 league title.
"It was a hard game, which we expected, but overall I believed in the second half we could score the goals which we did not in the first half, because we created space and it was a very convincing win".