Kean Bryan says he is 'excited' having penned a three-year deal with the Blades.
Bryan's move was rubber stamped on Thursday morning and the former Manchester City trainee is looking forward to life at Bramall Lane.
He remarked: "I first heard of the interest a couple of weeks ago and I've been training with City throughout the summer.
"I'm just so excited to get going now the deal is over the line. I've spoken to the manager and that's all it needed really, the positive football he wants to play and the ambition he has means I'm happy to be here."
The 21-year-old added: "I'm a ball playing centre-half who likes to get stuck and involved. I know how much this club means to the fans and I can't wait to repay the faith and belief the manager has shown in me.
"It's a big step up for me coming into the Championship as I've only experienced senior football in League One, but it is a great opportunity for me to come and play at this level."