"I'd like to remind you that we've had bad times here," Ferguson said after signing off his last match in charge at United's fortress home he had spent 27 years building up with a 2-1 win over Swansea City.
"The club stood by me. All my staff stood by me. The players stood by me. So your job now is to stand by our new manager. That is important."
Following Wednesday's League Cup semi-final exit at the hands of struggling Sunderland, that request is being severely tested by United fans all over the world who have gorged on the glory of trophy after trophy arriving at Old Trafford.
Their trophy hopes this season now lie only in the Champions League, where the English champions will remain confident of beating Greeks Olympiakos Pireaus in the Last 16 next month but less so of taking out others after that.
The challenge of European giants such as Barcelona, Real Madrid or Bayern Munich looks far beyond a confidence sapped side who have seen long unbeaten home records against Everton, Newcastle United and West Bromwich Albion all end this season.
The absence of Wayne Rooney and Robin van Persie from the starting lineup in recent weeks has been greatly felt, with reports linking both forwards away from the club, but the problems lie deeper than their return to fitness.
Defenders are making mistakes, midfielders are being overrun, chances not being created, while commentators question why Moyes is opting to be more defensive and shy away from the crowd-pleasing, attacking style his predecessor implemented.
"Of course, you would expect a better standard because, don't forget, there are a lot of internationals out there," Moyes said after the penalty shootout loss to Sunderland, who will play Manchester City in the final at Wembley.
"In the end, I just don't think we got the level of performance we needed to go through the game. If we had got through, I would have been disappointed with the performance, but I'm doubly disappointed that we haven't got to the final," he said.


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