The Red Devils take on Bayern Munich in the quarter-finals of the Champions League tomorrow night, with the German visitors regarded by many as the big favourites to advance through to the semi-finals of the competition.
However, Moyes believes that despite their poor Premier League form this season, United are "as good a side as any".
"We go into the game knowing, on our day, we're as good a side as any. We need to show it more often," he told reporters.
United have beaten Bayern just twice from their nine previous meetings.