United have completed the loan signing of Chris O'Grady.
The paperwork allowing the Brighton striker to join up with the Blades on a temporary basis was completed on Thursday afternoon, ahead of the loan deadline of 5pm.
The 28-year-old lists Leicester City, Rotherham United, Oldham Athletic, Sheffield Wednesday and Barnsley amongst his former clubs.
Speaking of the experienced marksman, Clough said: "It has been something of a drawn out affair, we have been chasing Chris for a while and we are just delighted to get it over the line until the end of January with a view to extending it.
"There aren't too many strikers of Chris's calibre around at the moment, we liked him last season at Barnsley and he has got good Championship experience.
"Chris was a target for us in the summer, but Brighton came in with a deal we simply couldn't match in terms of wages and what they could have been potentially offering him as a playing challenge.
"Talks of a permanent move haven't taken place, hopefully we will extended it until the end of the season come January and then re-assess in the summer."
O'Grady's loan deal expires on 31st January 2015.