The west Wales duo are fighting for a top four finish with the Ospreys currently holding the last qualifying spot.
They face Benetton Treviso tomorrow night, while the Scarlets face league leaders Glasgow Warriors tonight, and Jones is well aware of the task at hand.
"With ourselves and the Scarlets vying for that final spot, it's as big now as it can be," said the Ospreys captain.
"The final three rounds of games will see who features in the top four.
"It would be easier for us if some of the other teams dropped points, but we just have to focus on ourselves and look for three wins.
"That is the challenge - to play out the season unbeaten. It will be difficult, with Treviso at home and Glasgow and Leinster away, but we are going to have a crack at it.
"All we can do is target the wins and put ourselves in a good spot.
"If we miss out because another team picks up three bonus-point successes, there's not much we can do then."
The Swansea-based outfit have lost just one of their last ten league encounters and despite having a tougher run in than the Scarlets, Jones is confident his side can pass with flying colours.
"We have had a bit to work on this week but that hasn't been a bad thing," said Jones.
"The aim is to build on our display against the Dragons rather than against the Blues a week last Saturday because we weren't at our best in Cardiff.
"We were a bit down after the Blues game, but that shows where we have come from.
"We always have the mentality that we can perform better. It's not a bad way to think.
"Treviso will be a good test. They've beaten us twice this season, so we are under no illusions about what they offer.
"They are one of the most physical sides in the tournament and have good backs as well, so we will need to be at our best."