Jack O'Connell admitted Saturday's reversal at Swansea City represented a missed opportunity for the Blades.
Speaking after Oli McBurnie's strike settled the contest in Wales, O'Connell conceded a slow start to the second-half was decisive.
He remarked: "It's another one that is tough to take. Swansea isn't an easy place to get a result, but if we'd taken those chances in the first-half it would have been a completely different game.
"We had a sloppy start to the second-half and they managed to get a goal, we're disappointed to concede after three clean sheets, but we'll look to put that right against Norwich."
The influential defender added: "We knew it would be a tight game and the Gaffer said at half-time that the first goal wins the game, that poor ten minutes proved costly.
"We have to take care of business ourselves, we knew the other scores kicking off later, but unfortunately we couldn't take advantage."