McDermott proud of Old Trafford display
"It's a proud night for us because the players have given everything and showed real quality," he said. "We wanted to try to get through and we did everything we could, they gave us everything tonight.
"I think our supporters thought we were going to nick a goal for them at the end too. We've done that for them many, many times this season and many times over the last three years. But it's wasn't to be tonight."
McDermott's counterpart, Sir Alex Ferguson was forced to introduce two of his big guns from the bench to edge past the Royals at Old Trafford - Phil Jones' first half replacement and scorer of United's first, Nani, and the Barclays Premier League's top scorer Robin Van Persie.
"Their manager, Sir Alex Ferguson, he knows how to get results and I think he'll be quite relieved tonight knowing that his side have gone through.
"It could have been 1-1 and seconds later it's 2-0. But I'm pleased with everyone of them out there - it was a real good effort."
Now, it's back to the points business and the visit of Wigan in the league on Saturday. "We've got confidence from that, but we've always had confidence.
"We're trying to play the right way, we're trying to play football with the right levels of aggression and quality.
"Now, we've got twelve games to go and we're looking forward to every single one of them."