Ospreys captain Ryan Jones admits their Heineken Cup hopes are hanging in the balance and that it is time to deliver in their Saturday showdown with Leicester Tigers at the Liberty Stadium.
"We have to win and that's the first hurdle - the rest will take care of itself and, as the game progresses, we will see where we stand," said the Wales captain.
And the winner of Pool 3 and automatic quarter-final qualifier may only be confirmed when French referee Christophe Berdos calls a halt to proceedings at the end of 80 minutes of potentially explosive action.
Leicester Tigers go into the match in the box seats with 20 points to the Ospreys' 16 points - though the Ospreys picked up a valuable losing bonus point in their 12-6 defeat at Welford Road back in October.
A Tigers win would settle the issue in one easy step and a regulation Ospreys win with Leicester walking off with a losing bonus point would also be enough for the former double champions to go into the last eight.
But there are plenty of other possible permutations and outcomes.
An Ospreys win with a try bonus point and the Tigers drawing a complete blank would hand top spot to the Welsh region on match points while a regulation Ospreys win and the Tigers again leaving empty handed would also push the Ospreys through on that losing bonus point in Round 1.
And if the Ospreys take five points with a try bonus win and the Tigers a losing bonus point then again the Ospreys qualify on the match points earned in matches between the sides.
"It's our goal to qualify for the quarter-finals," added Jones. "Once you get out of the Pool stages, all bets are off and you start building again. That's our target and what we want to achieve next weekend.
"It's a massive game in our club's history and another hurdle for us to get over and go the extra yard in Europe. It will be a great occasion and we're looking forward to playing under that pressure with the crowd and expectation. We've got character and the game will bring out the best in our players.
"And, having been on the receiving end of a disappointing loss at Welford Road, we know full well that they're a Heineken Cup team who do really well year in, year out.
"They have perfected a style and composure which allows them to win big cup games. We have to take a lot from that then overcome it.
"We can't afford to make any mistakes. We have to cut out the errors and be clinical. We can't drop passes and make sure we take the points when they are on offer."
And team-mate Jonny Vaughton added: "Getting out of this pool is everything to us. The Heineken Cup is the tournament we want to strive for. Saturday's game is one of our most important so far and we're looking forward to it.
"We're definitely confident going into the game against Leicester off the back of our match in Perpignan. We¹ll have home advantage and hopefully the crowd will get behind us on Saturday which will be a big boost.
"The Tigers have a strong pack which is something we'll have to take a look at - but I think we'll focus on our game and make sure we cut out the errors so we can go into the game positive and confident."
Finals Edition: Listen to the best guide to the European Rugby Cup Finals weekend in Dublin, which sees Leinster Rugby take on Stade Francais Paris at the RDS on Friday night in the Amlin Challenge Cup Final and then ASM Clermont Auvergne tackle Toulon in an all-French affair at the Aviva Stadium on Saturday.