Chris Wilder offered no excuses following his side's poor performance in the Checkatrade Trophy on Tuesday night.
The 2-1 loss against Walsall at Bramall Lane, coupled with Leicester City's victory over Grimsby Town, means the Blades will be eliminated from Group H of the revamped competition.
Reflecting on the loss to the Saddlers, the Blades boss commented: "It was a poor display and I don't think we turned up at all.
"It was a bit of the old Sheffield United out there. I can think whatever I think about the tournament. But that shouldn't relay onto the players.
"We prepared for it the same as a league game but it looked as if it did relay onto the players because it was a really below par performance.
"The opposition didn't outplay us but their attitude was better. I've told the players I don't like that."
The Gaffer added: "I took a bit of a step back to see, with few people in the ground, who was going to drive us on."
"There was a few who didn't do themselves any favours out there. A few have let themselves down a little bit, so I'll make a mental note of that."