Summer signing number six is in the building... Ben Osborn is a Blade.
"We are delighted that he is a Sheffield United player," said boss Chris Wilder, who has swooped into the Championship for a third time for a signing following similar moves for Luke Freeman and Callum Robinson.
"He's been a fantastic player for Forest in the Championship and I know for certain that two or three clubs in January were sniffing around to take him. He's got a lot of attributes that will help us, going forward, and we're looking forward to him pulling on a red and white shirt.
"Ben is an intelligent footballer, he plays a number of positions and has got that attitude that he will slot in wherever. But he'll want to nail down a position and he's going to put enormous pressure on a few of our players who might think they're cemented into the team and that's how it's got to be, I've said all along, it raises everybody's standards. We are putting together a group that's got to be competitive in arguably the best division in the world.
"We're not getting flustered with people talking about where we are getting our players from, we're delighted with the work we've done, I'm really excited and seeing the players we've got in the building already, from Jags to the likes of Ravel (Morrison), Lys Mousset, Callum Robinson, Luke Freeman and now Ben Osborn."
Derby-born Osborn started his career with the Rams, before joining Forest's Academy at the age of nine. Deployed mainly as a left-back during his first season in the U18s, Osborn was voted the Reds Academy Player of the Year, earning himself a new contract in the process in April 2012.
Osborn was promoted to Forest's first team and made his debut in March 2014 against Ipswich Town.
Capped by England at various youth levels, Osborn has become one of the Championship most consistent performers in his position and offers versatility.
During his decade at the City Ground, Osborn has made over 200 appearances, scoring 15 goals.
Osborn signs a three year deal after an undisclosed fee was agreed with Nottingham Forest.