Sumas go into the first round proper meeting at Larges Lane on the back of an outstanding 11-game unbeaten run that has seen them avoid defeat since August 21.
Notable scalps picked up along the way include Flackwell Heath, Highmoor Ibis and Newbury, who Sumas beat 2-1 on Tuesday evening thanks to goals from Sam Duffelen and Dean Thomas.
"Marlow is going to be a tough game, but the pressure is off us and all on them, they are expected to win," Herridge told the News.
"They are one of the best resourced sides in the division and you can see that in the squad they have.We will make things difficult for them and will be full of confidence after our run. We can cause them problems."
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