Chris Wilder says he'll continue to make demands from his players as he looks to maintain what has been a very encouraging start to the season.
Speaking prior to Tuesday's home clash against Stoke City, the Blades boss insists his side must be at their best to enable them to compete at the right end of the table.
He remarked: "I'm after perfection, we need high standards all the time if we're to stay in the position we're in and compete at the top end of the Championship.
"We have to continually keep producing because there are a lot of big hitting clubs in this division and the quality goes right the way through the league.
"I'm not going to be soft on the players, but I am going to be realistic. We've set high standards previously and they need to be maintained moving forward."
Wilder added: "Martin Cranie has been outstanding since coming into the football club and with George (Baldock) ill he finally got an opportunity in the squad.
"He's knocking on the door and we've got some really good players who aren't getting into the 18 on a matchday at the moment, they need to keep impressing in training and be ready when the opportunity opens up.
"They've got to be patient, we're winning football matches and we aren't looking to make drastic changes and be changing systems.
"We've talked after Saturday about doing better in key moments of games, but generally in the first 13 games we've done a lot right."