All kinds of mathematical permutations, though, mean both teams could end up progressing to the knockout stages - while a Leicester victory hands them a home draw.
It is a game that has captured the imagination, and Jones is relishing a fixture of such huge importance just two weeks before Wales launch their RBS 6 Nations title defence against Scotland at Murrayfield.
He said: "We have to win - that is the first hurdle.
"The rest will take care of itself - and as the game progresses, we will see where we stand.
"It is our goal to qualify for the quarter-finals.
"Once you get out of the pool stages, all bets are off - and you start building again. That is our target and what we want to achieve on Saturday.
"It's a massive game in the Ospreys' history, and another hurdle for us to get over and go the extra yard in Europe.
"It will be a great occasion, and we are 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.
"We know full well that Leicester are 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 we must make sure we take the points when they are on offer."