Kevin Blackwell admits he is having to be patient as he looks to bring Wigan Athletic midfielder Michael Brown back to Sheffield United.
Brown is currently on the fringes of the Wigan team, but Steve Bruce is reluctant to sanction a loan move.
Blades boss Blackwell has expressed an interest in signing the 31-year-old as he looks to increase his options at Bramall Lane.
"I have spoken to two clubs, including Wigan, about players I am interested in, but I have to be patient, because injuries, suspensions and international calls make clubs reluctant to let them out," Blackwell told the club's official website.
Worth the wait
"The boot is on the other foot now because that is how I was about requests for my players leading up to the transfer window and cup games.
"Steve Bruce has been brilliant with us, very honest and up front about his situation. He has injuries and suspensions, so Michael Brown is part of his squad, and that is the situation with one or two others elsewhere.
"But I am not looking at Premiership reserve players who will never figure, I am looking at targets who are in the squads and could make an impact for us.
"I have to be patient, as we were when Michael Brown was eventually signed here. It took weeks, but he took us to another level because he was the right one and it was worth the wait."
Hull City winger Peter Halmosi has also been linked with a move to the Blades, but Blackwell did not confirm an interest in the Hungarian.
He added: "He is not in the side at the moment, but Phil Brown needs a squad to survive in the Premiership, and most players need time to settle in."