Chris Wilder says he has no regrets about changing the whole team for Wednesday's Carabao Cup tie against Walsall, especially having progressed to the second round.
But the boss admitted some of those who did play didn't do themselves justice and says the standards must improve further.
He remarked: "I've always said to the players that you have to take the pats on the back with the criticism when it comes, you've got to be big enough and strong enough to handle it.
"Our players are and understand that, we chucked a team out there with the aim to progress and we succeed.
"Individually I wanted lads to do better and they've been told. There were a few B's and C's, but I'm looking for A's."
Wilder added: "It wasn't our first XI who know the system and how we play, so they deserve some leeway, but I won't give them too much because they need to perform.
"We didn't play as well as we can do but we won the tie and that's a great habit to have."