With the victors progressing to the quarter-finals, much is at stake at Broadhall Way this weekend.
"It's going to be a tough game. You've only got to look at this year, they've hammered teams like MK Dons and Sheffield Wednesday at home. It will be a very difficult game," the manager told his weekly press conference.
"They've got a new young manager and I think they'll be up for it, but we're a good team, and if we play as we can play, we should win. But we'll need to be at our best. They've done well and are right in the promotion race.
"But we're playing well and I've got great confidence in these players."
The Boro are in great form with only one loss in their past ten league fixtures. Gary Smith's team have only lost three of their thirteen home games in League One this season and Harry is fully aware of the challenge ahead.