Solskjaer said, "We have got to hold our hands up and say it wasn't good enough.
"In the first half we created some half openings but we were not sharp enough to take our chances. They were clinical and efficient and defended well. we couldn't open them up.
"The boys have given everything they have got but they are experiencing this period for the first time in their lives. When you are at Manchester United you are playing at the biggest and best club in the world. Some of them have played 10, 12, 15 games and it's not easy for them.
"I'm going to back them and help them get through this. We can't do anything but hold our hands up and say it's not good enough.
"You can talk about it all day long and we are disappointed with our points tally. We work every single day for these boys to improve and perform better than this."
The Norwegian also stated: "We are looking to improve, we have got our targets. This is our second defeat at home and first since August. I thought we had turned that corner.
"We have started a clear-out and now I am going to be answering these questions until it [transfer window] closes. We are working on things.
"For me the most important thing is we have to perform on the pitch. Tonight wasn't good enough for a Manchester United team."