Nigel Adkins says he must reflect and find solutions following United's 4-2 home reversal at the hands of Shrewsbury Town on Tuesday night.
Despite taking the lead through Conor Sammon, the Shrews hit four goals without response before Dean Hammond's first goal for the Club gave a little hope but Adkins offered no excuses when speaking post-match.
The Blades boss remarked: "It is a bad defeat, there is no other way to put it. It was an unacceptable performance and we aren't anywhere near where we want to be in the league table.
"But it is pointless feeling sorry for ourselves, that will get us nowhere, what I have to do is reflect and find solutions because the beauty of football is the next game gives you a chance to get a positive result.
"So we now have to assess things and lift the players for a South Yorkshire derby at Barnsley on Saturday, where the three points is our only focus."
The Gaffer made three changes at half-time with the Blades trailing 3-1 and admitted conceding so soon after the restart was hugely detrimental to hopes of a comeback.
He added: "I am honest and up front, I won't shy away or make excuses.
"At half-time we made changes to the personnel and also our approach. We went direct in a bid to get the all-important next goal and we go an concede one on the break from our own free-kick on the edge of their penalty area.
"That summed up the night really, it is bitterly disappointing and frustrating that the game went away from us in 10 minutes having opened the scoring through a well taken effort."