Kevin Blackwell has admitted he will think about extending Keith Treacy's loan deal if the midfielder can impress.
The 20-year-old has joined Sheffield United from Blackburn and is set to stay at Bramall Lane until the New Year.
Treacy stated last month that he would be keen to stay with the Blades for longer and he scored a superb goal in the 1-1 draw with Leicester on Tuesday.
However, Blackwell has now challenged the youngster to turn in consistent performances over the next few months.
"The option is there (to extend the deal), it is clear that he is lacking match fitness," Blackwell said. "He hasn't played a lot of football at first-team level.
"We will look at the long-term and if he does well between now and Christmas to possibly extend it."
Meanwhile, Blackwell has revealed he has a host of players on trial with the Blades as he continues his drive to strengthen the squad.
"I have got two Spanish lads, a Nigerian and I've got Jonathan Fortune and (Mark) Fotheringham. They're the ones that are here trialling."