Mike Allen has arrived as new head of recruitment and Jamie Hoyland as new first-team chief scout.
Wilder said ahead of tomorrow's clash at Everton: "A lot of great things have been said about Paul Mitchell (Blades' former head of recruitment).
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"It's important from a recruitment point of view that the players we bring in are good players and have a good character as well.
"Delighted to get them boys (Allen and Hoyland) in. We have interviewed quite a few people for it.
"They can help us with arguably one of the biggest transfer windows in the last few years."