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Robin van Persie has admitted Manchester United's draw at Cambridge United was not good enough but says the squad were boosted by Saturday's upsets.
Chelsea, Manchester City, Tottenham and Southampton all crashed out against lower-ranked opposition handing United the initiative should they find a route past League Two Cambridge next week.
"After the game against Cambridge, everyone was a little bit down," Van Persie said.
"But in a way on Saturday the whole mood changed. City were out, Chelsea were out and suddenly we are in it with a home tie against Cambridge.
"We are the highest-ranked team left in the competition."
Where do football fans buy their shirts?
Van Persie is desperate to win the cup with United, who have gone through a barren spell in the competition of late.
"I think it is vital (we win a trophy this year), especially with this cup," he said.
"I think it has been 11 years since Manchester United won it last.
"That was actually the first thing that Sir Alex Ferguson said to me as well - he said 'I want to win that cup'.
"We want to win it."
:: Robin van Persie was speaking at the launch of Swissquote, Manchester United's first global Official Forex and Online Trading Partner.
