United crashed to a shock 2-1 home defeat against Crystal Palace to exit the competition.
“I’m so disappointed and I also have to apologise to the players who weren’t playing. We never expected that. Any time we go on the pitch it means a lot to Manchester United. We have our pride to protect and our history to protect. Every time we walk on the pitch it’s important. We didn’t see that tonight. There were nine internationals out there, so that was a big disappointment.”