"Everyone in the dressing room is completely devastated," the Liverpool Echo quotes Allen as saying. "It's the worst feeling in football. To concede three goals in the manner we did was bitterly disappointing. We wanted to do well in the FA Cup but now we're out.
"I don't think we underestimated them. But, no disrespect to Oldham, when you've been knocked out by a team in League One then something has definitely gone wrong somewhere. It hurts and I feel sorry for the fans. When you are representing Liverpool, you represent them."
The Reds' defeat is the first time since 1959 that the club have lost an away FA Cup tie against a team at least two divisions below them.