Danny Wilson is adamant that George Long will bounce back from Saturday's experience.
The teenage goalkeeper was caught in possession in front of the Kop as Yeovil Town added their second goal in the weekend's League One clash.
But the United boss has nothing but positive things to say about homegrown, Sheffield-born Long, who has now made 27 senior appearances for the Blades.
"It is a moment of indecision from George - he has seen something he wanted to do, then at the last minute has changed his mind," said Wilson.
"You have to give credit to the Yeovil striker because he has ran 40 yards for his goal, but in the same situation in the future George will make the right decision.
"I had looked away and the next thing there is a deathly silence and the ball is in our net. Unfortunately for us, the ball has bounced the way of the striker, but that happens. These young lads will make mistakes, that's part of learning their trade, and as a goalkeeper you usually get punished.
"George has been fantastic, though, and I am confident he will learn from his mistake and what we have to do is make sure he thinks that too.
"We will put our arm around him but he will get over it, mentally he is a tough boy."