Ryan Flynn is refusing to underestimate Port Vale in Saturday's second round FA Cup tie at Bramall Lane.
The Valiants, managed by former Blades boss Micky Adams, arrive at the Lane in second place in League Two and Flynn has acknowledged that United's place in Sunday's third round draw is far from a forgone conclusion.
Looking ahead to the weekend, the Scottish winger said: "Of course it going to be a difficult tie and with the return of Micky Adams, I am sure that will add a bit more spice to the occasion.
"When you are in the second round of the FA Cup all that matters is progressing to the third round when you could draw a big gun.
"All you ask for is a home tie, the fans will be excited because it is the FA Cup and for the players it still has that 'magic', so we must make our home advantage count."
On the threats the visitors will pose, Flynn added: "Port Vale will come here with nothing to lose so we expect them to give it a real good go.
"They have several attacking players who are dangerous, but obviously Tom Pope is the name everyone mentions because of his goals this season.
"They are the underdogs if you like but they are right up there in League Two so no doubt they will be confident and play without fear.
"We are focusing on ourselves, though; we know if we are right at it from the start then we should have enough to progress to the next round."