The south Yorkshire club confirmed their place in the League One play-offs but saw their hopes for automatic promotion end with the loss.
Morgan said: "It's disappointing but the result doesn't worry me. Sometimes you have games like that. We've not done a great deal wrong.
"It's important we have a lift, we need to follow the form we had before the first half. We need to take that into the play-offs.
"But it's one defeat, we're not going to get carried away by one defeat. There's no point taking the players in the dressing room and shouting 'this wasn't right, this wasn't right'.
"We have to learn, look at the points we are not happy with and we need to learn from it. We have to go back to the training ground and work hard at it."