With three rounds to go before the semi-finals, South 10 points (fifth) need a win to take back fourth spot from Roopena, 11 points when they take on bottom team Iron Knob at Schulz Reserve on Saturday afternoon.
South's leader Simon Trezise will need to instil on Nikolas Buhlman and Peter Sawtell not to take Cleasby's Knobbies lightly, or they might just make them pay.
Iron Knob's Jason Casey and John and Ronnie Davis would dearly love to put a spanner in the works, stopping South from qualifying for the finals.
Trezise hates to lose any match and realises the battle can only be won if all his team members understand the urgency of the situation as Roopena do battle with the Left Hand Club.