Ferguson believes Iker Casillas' injury worked in Real's behavior.
Reflecting on the second-leg defeat, Ferguson said: "We could have scored five goals in the last 15 minutes. If we'd scored a second, we probably would have won it. I think Jose said that himself. There was all this issue with Real about [Iker] Casillas. But Casillas wouldn't have saved the shots that the boy [Diego] López saved. Going out to Danny Welbeck, going down at Robin van Persie, coming out and whacking [Nemanja] Vidic in the head. Casillas isn't that type of goalkeeper and that saved them, having that type of goalkeeper. We know we were the better team.
"When you're at this club a long time, it is not always silver linings. There are always dark moments and bad days. In general we recover very well and we'll do that again."