The Canaries travel to the North East knowing a win would all but guarantee a fifth top 12 finish since being promoted to Step 3 in 2011.
Barwell boss Ginnelly hopes to spring a surprise on the hosts- who may have one eye on their crucial play-off semi-final the following week- but is fully aware of the quality they possess.
He said: "It's been part of my team talk for the last few weeks. We don't want to end the season on a low.
"Playing Spennymoor will be a monstrously tough match, but we could catch them out, if they decide to rotate ahead of their play-off semi-final.
"It'd be great to go up there and pick up a result against a top side like Spennymoor".
Source: Barwell FC