Playing in front of their home crowd at Memorial Park, the Roos put on a dominant display to win by 101 points in the final round of the Picola & District League.
The home side were in control early, leading by 39 points at half time, before a stirring display in the third term, where the Rovers kicked 8.6 to Yarroweyah's 0.2.
The final stanza was an arm wrestle, with the Roos winning the quarter 3.4 to 2.1, cruising to a win in preparation for an elimination final against Picola United this Sunday.
Dylan Kerr was a clear best on ground for the Rovers up forward, setting up multiple scores for his teammates.
Josh Flight and Ricky Waters kicked five goals each with Terry Lumbar contributing four, Brendan Hope, Ray Murphy and Andrew May all strong.
Corey Percy, Tim Atkins and Marcus Hill were best for the Hoppers, who ended the season ninth, one win and 18 per cent back from eighth.
Final score, Deni Rovers 20.14 (134) to Yarroweyah 5.3 (33).
Rovers coach Josh Bode said his side showed more improvement from the previous week's win over Rennie.
"Last time we played Yarroweyah it was a tight battle, but we're playing a lot differently now compared to then," he said.
"We've had a focus on ensuring we improve each week and we definitely achieved that again this week.
"We started a little bit scratchy and were fumbly in the first quarter, but we got it all together in the end.
"We played team footy once again. There were no passengers and everyone brought the right attitude."
While crediting the win to a team effort, Bode said there were plenty of individual efforts that shone throughout the clash.
"Hopey was great in the ruck and Maysie (May) was everywhere," he said.
"We gave Ray (Murphy) a full game and even though he's only 15 years-old he was a class above.
"Terry (Lumbar) has been playing his best footy that I've seen him play over the past few weeks as well.
"All of these blokes playing so well comes down to everyone else playing their role though.
"We're playing predictable footy to each other and are getting the best out of everyone."
The Roos reserves are well prepared for finals, following a 55 point win over the Hoppers.
Yarroweyah were kept goalless in the first half, with the home side dominant from the opening bounce.
Final score, Deni Rovers 10.8 (68) to Yarroweyah 2.1 (13).
Best players for the Roos were Jamie Thorpe, Brayden Thomas, Jaycen Pattinson, Caleb Weir, Bodey Arthur and Riley Draxl.
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