Nigel Clough was keen to praise the Blades rearguard in the 1-1 draw at Leyton Orient on Saturday, particularly the performance of George Long.
Speaking after Dean Cox's stunning volley denied the Blades a crucial win in the capital, Clough reserved a special mention for his young goalkeeper.
The Gaffer remarked: "The back four, in particularly George (Long), were outstanding.
"His handling, kicking and everything about his performance was magnificent, he looked very mature."
"Communication is an area where you want young goalkeepers to work hard and it was proved in this game, it was great to see, deep into injury-time, when he came to the edge of the box and told Harry (Maguire) he was coming.
"He is a presence physically and we want him to show that on the pitch. His saves kept us in it. We need to be resilient, we need a 'don't lose mentality' and the back four have contributed heavily to that of late."
Clough added: "We are making progress; to only lose two out of the last nine is a start and it has got us moving in the right direction."