Speaking to the BBC after the final whistle, De Gea said: "It is not acceptable, not just this game but the whole season. It is the most difficult time since I have been here. I don't know what is happening. We cannot even score one goal in two games."
"We didn't create any proper chances. We defended well. The team needs to step up. We have some big injuries but that’s no excuse. We are Manchester United, we need to keep training hard, fighting and winning games.
"It's a hard moment for us. The most difficult time since I've been here. I don't know why, what is happening. Sorry to the fans. We will keep fighting. Come on, we conceded a goal from a comer. That cannot happen. It's unacceptable."