Nigel Clough says the Blades are beginning to see the best of Jamie Murphy but has urged Marc McNulty to step up his game.
Both men got on the scoresheet in the 2-0 win over Yeovil on Tuesday night with McNulty netting his fifth goal in his last six League One appearances.
The Scottish forward has received plenty of praise for his recent performances but United chief Clough has warned him not to let his standards slip.
“I don’t think Marc played that well, particularly in the first ten or 15 minutes,” Clough said.
“Then he got his poacher’s goal and that’s what he’s in the team for. But I think he needs to do more on his all round game again.
“He should have caused their two big centre halves a lot more problems. He should have run the channels more.
“When we get the ball out wide, it opens up an awful lot of space around the centre halves and he should have exploited that more. We know all about Marc’s qualities. We’ve seen them before and he needs to make sure we see them all the time.”
Of the two scorers, Clough made no secret of whom he thought was more deserving of their strike, praising Murphy for his steady improvement following his second goal of the season.
“It was good to see Jamie get on the scoresheet and he deserved it as well,” he said.
“We’ve seen in the past fee weeks that he’s getting better with every game and closer to the type of form we know he can produce.
“The pleasing thing about his goal was that when he went through, he didn’t look like missing.
“We never once felt like that on the bench.”
Clough is set to continue his pursuit of a loan signing ahead of Saturday’s trip to Crewe Alexandra.
But he admits the capture of his primary target – an experienced head rather than a Premier League youngster – is not yet close to completion.
He said: “We’re not particularly close on that at the minute.
“We’re a way apart on wages and things like that.”