David Moyes's side were torn apart by their rivals as goals from Steven Gerrard and Luis Suarez secured a 3-0 win for the Merseysiders at Old Trafford, a result that Rooney described as one of his worst days in football.
United did, however, recover from the demoralising defeat to beat Olmypiakos and reach the Champions League quarter-finals and, after Goal revealed the crisis talks between Moyes and his backroom team, Rooney has now lifted the lid on how the players met to discuss their plight.
"I'm not going to confirm the details of what happened, but obviously we talk," the England international said, as quoted by the Daily Mirror. "We talk after every game, whether we win, lose or draw, but we knew as a team what went wrong on Sunday.
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"To lose 3-0 the way we did was hard to take and we had to stand up and really be at our best against Olympiakos, because that wasn't good enough. We’ve done that, but we have to kick on now and we have to give performances like that every week."
And Rooney now believes that the impressive 3-0 triumph over the Greek champions can inspire United to go on and win the Champions League. When asked if lifting the trophy this season would be possible, he added: "Yeah, I think we can.
"In cup football anything can happen. With a bit of luck, hopefully we can go far. We’re in the quarter-finals, so you never know what can happen from there."