He added: "It depends on how the games go and how much effort the teams put in - but no win is guaranteed in the Premier League.
I am not sure whether Steven Gerrard and Fernando Torres will play
Arsenal boss Arsene Wenger
"I would love to put some more pressure on Manchester United. I feel it is very important to win our game against Liverpool first and therefore we need to be at our best.
"Everything is still possible, of course - but the main thing for us is to win our games.
"Five wins and a draw is a minimum but that means we would have to win at Old Trafford. Six wins would be better."
Wenger pits his wits against Liverpool coach Rafael Benitez for the second of their three games in six days, the league match sandwiched between the two legs of their Champions League quarter-final.
He knows how important Tuesday's second leg at Anfield is with the tie poised at 1-1, but says everyone's focus should be on Saturday's league game.
"I will pick a team which can win the game on Saturday. I feel we have a good chance in the championship and do not want to miss that," said the Frenchman.
"For us it is important to win because of the situation in the league. It would have a double impact - one for the league and one for the Champions League.
"I never analyse the league when we have things in our own hands but this time that is not completely the case so we have to see where things can turn and change.
"Now it gets so tight you have to think about what might happen elsewhere.
"It can change much quicker than people think."
Wenger also believes Liverpool, five points clear of Everton in fourth but eight points adrift of the third-placed Gunners, can afford to rest players on Saturday with Europe in mind.
"I believe they will make changes. I am not sure whether Steven Gerrard and Fernando Torres will play," said Wenger.
"They have a big squad and a lot of experienced players who didn't play on Wednesday. To my calculation, eight players with big Premier League experience."
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