Durham’s players have been warned not to lapse into complacency for their Clydesdale Bank 40 group game against Surrey Lions on Monday.
Dynamos need a victory to be certain of qualifying for the semi-finals as best-placed runners-up.
However, even if they lose the clash at the Kia Oval (1.45pm), they could still make it through to the next round should rivals Essex and Nottinghamshire fail to take advantage.
But head coach Geoff Cook insists Durham can’t allow themselves to start thinking they are safe.
He said: “Every game between now and the end of the season is a big one.
“We have to remain focused, and get back to the sort of cricket we were playing earlier in the season.
“Every competition is important to us, and if we want to progress, we have to perform.
“We don’t concern ourselves too much with what the other sides are or aren’t doing.
“It’s about how we perform, and we know that if we win against Surrey then it doesn’t matter about results elsewhere.
“It won’t be easy because Surrey are top of our group and have played some very good cricket in this competition.
“But if we play as well as we can, and get that little bit of luck, there is no reason why we shouldn’t get a good result.”
* Full story in tonight’s Sunderland Echo