The Manchester Derby will determine one of the finalists of the Carabao Cup this season after both sides progressed on Wednesday.
Manchester United left it late to beat Everton 2-0.
Edinson Cavani scored in the 88th minute before Anthony Martial added some gloss to the scoreline in time added on.
“It was a very good start. In the first 20, 25 minutes I thought we were excellent, we should have been one, two or three up, but Robin Olsen made a few good saves and kept them in the game,” said Ole Gunnar Solskjaer.
“Then they had a good spell, just before half-time, but in the second half, I thought we dominated. I can’t remember Dean [Henderson] having a touch on the ball really.
“We almost did an Everton on them, we were in the box, we had corners, we had set plays, crosses and chances. I’m a bit disappointed we didn’t go one or two goals up, but it was an excellent performance in the second half as well.”
The Red Devils will host Manchester City, who breezed into the last four thanks to a 4-1 thrashing of Arsenal. The result will no doubt heap pressure onto Mikel Arteta as the Gunnars continue to struggle in the league and now have crashed out of the Cup.
“We have to turn it around, there’s no question about that,” Arteta said.
“We are in big trouble. I am focused on the fighters we have. I see a lot of fighters. This was a really painful moment again. We conceded a soft goal really early and to get through that is difficult but we reacted and scored. After that we were the better team but then we conceded another soft goal.
“When you give away the goals that we gave against an opponent like this, it makes the game impossible. Then, we have an open situation when we can play Lacazette through and they score on the counter and from an offside position. After that, the game is over.”
Meanwhile, the other semi-final will be between Tottenham Hotspur and Brentford. Both ties will be played in the week commencing 4 January 2021.