Harry Maguire has warned his team-mates that performances must improve soon, to prevent the Blades falling off the pace in the race for promotion back to the Championship.
Maguire opened the scoring at Notts County at the weekend, but despite having a numerical advantage for over an hour after Francois Zoko's dismissal, the Blades surrendered their advantage ten minutes from time following a lacklustre second half display.
Giving an honest assessment of United's performance at Meadow Lane, the defender said: "The lads are very disappointed because for long periods we were comfortable but ultimately we have conceded a sloppy goal from a set-piece and dropped another two vital points.
"We don't want to still be in League One at the end of the season and everyone knows we have to improve and take responsibility both individually and collectively.
"With the squad we've got we are more than capable of going a long unbeaten run again, as we did at the start of the season.
"But we need to do it quickly because, as we all know, we're in January and the games will continue to come thick and fast.
"We've dropped too many points already and we all feel we should be closer to the automatic promotion places."
Maguire believes United's failure to take the game by the scruff of the neck allowed County hope of getting something from the game, which they did when Alan Judge headed home from Alan Sheehan's inswinging free-kick.
He concluded: "We started well and we were better even against 11 men but we didn't have the killer instinct again.
"We gave County too much respect when they had 10 men and paid the price for a lack of concentration."