Nigel Clough is predicting the Blades toughest test of the season to date on Saturday, when United make the trip across the Pennines to face Preston North End.
The Blades boss believes North End, managed by former Leeds and Huddersfield manager Simon Grayson, are very likely to be a top six outfit this season.
Speaking ahead of departing to Lancashire, the Gaffer remarked: "Preston are a club that have been building year on year for the past two or three seasons.
"They are edging ever closer to promotion and will be disappointed they didn't get over the line last term, but each season they are banging on the door and their time probably isn't far away."
Looking ahead to Saturday's clash, Clough added: "Deepdale is always a tough place to go as a visiting club, we didn't play anywhere near our best there last season and held out for a goalless draw, but they will be aware that we are a dangerous side, especially on the break.
"They had a cup tie in midweek too, but they made a few more changes than we did and didn't have to travel to London, but we will certainly look to take a lot of momentum from Tuesday night into the weekend, they will also know we have now had three positive results on the spin.
"We have told the players we need one final big effort to complete the first month of the season before we head into the international break and we are confident they will respond positively.
"If we can go into the break with three consecutive league wins, having lost our first two, then that will be excellent progress and give us something to build on when we return to action against Rochdale in September."