Although his side scored three goals at Old Trafford, Blackburn Rovers boss Paul Ince said the defensive side of their game had to drastically improve after conceding five to Man Utd.
"It was difficult but in the first half we started well. We had three good chances in the first half and were doing okay for 30 minutes," he told Sky Sports News.
"We felt comfortable. We weren't playing particularly well, but we didn't look in danger.
"But we conceded goals pretty early and you can't do that against teams like Manchester United.
"I said at half-time that it was important who got the next goal, if we got it we had a chance.
"We did that, with a great finish from Benni (McCarthy), but then we gave away a penalty straight away.
"You can't do that at any level, nevermind against Manchester United.
"I wasn't sure it was a penalty but that killed us. We feel we are back in the game at 2-1 but we keep doing it to ourselves.
"Saying that, we got three goals at Old Trafford."