Speaking to BBC Sport, Sheffield United manager Chris Wilder said: "We went toe-to-toe for 80 minutes, got ourselves in front a couple of times. But it was the same old things that have come back to haunt us, poor defending.
"I've got to say, I'm really disappointed with a couple of the decisions as well. I think the free-kick, I don't know what my centre-half is supposed to do, just walk out the way? He's nutmegged him, but he can't disappear.
"That said, we've not really defended that situation as well as we should have done. I think he's blown early on the penalty. I think it's a really soft penalty if I'm honest about it. There is always contact in the box. It's a really soft one.
"Yet again, it's a mixed bag. A lot of things are pretty good. We've scored two at Old Trafford and we've come away with nothing. That's something that shouldn't be happening. You should be getting something out of the game."
Manchester United came back from 2–1 down to beat Sheffield United 4–2 at Old Trafford in the Premier League on Wednesday night.
The result keeps the Red Devils in the race for the Champions League football as Erik ten Hag aims to stay in charge at the club next season.
