United have signed defender Reece Brown on a short-term contract.
The former Oldham Athletic, Barnsley and Bury operator has signed a deal until January and is available for Saturday's encounter against league leaders Scunthorpe United.
The 24-year-old free agent had been on trial with the Blades and played in an U23s encounter earlier this week.
Boss Chris Wilder is happy to have concluded the deal with Brown, commenting: "He comes in and gives us cover at right back or right wing-back. He adds weight to our squad and knows the division well.
"He has done everything we have asked of him, trained well and impressed. His pedigree is good and this is an opportunity to earn a longer deal."