Gunners are 2-0 up in their Champions League
play-off.
But boss Wenger said: "This game is a more important
one than Saturday for the club, by far. We have to give absolutely
everything be- cause tomorrow you cannot come back.
"Saturday, even if we drop points against Manchester
United, we can always catch them up - you have 35 games still to
go.
"If we lose the game against Celtic, we have zero. It
is a massive game."
Arsenal could scoop around £25million by taking part in
the Champions League group stages alone. But the Emirates chief
insisted: "It's not the huge amount money that makes it such a huge
fixture for us.
"It's not the financial blow that matters, it's that we
want to be in the Champions League and this is a much bigger game
for us than Saturday."
Arsenal are massive favourites to go through after
their first-leg victory in Glasgow.
But Wenger insisted: "It is not job done, it is job to
do. That is how I approach it.
"Celtic have no choice, they have to come out and have
a go at us. We will be faithful to our tactical approach."
