Manchester United manager Sir Alex Ferguson has played down talk that his side can complete a clean sweep of trophies this term.
United have already secured the Community Shield, Club World Cup and the Carling Cup this season.
They lead the Premier League, are in the semi-finals of the FA Cup and the last eight of the Champions League.
However, Ferguson believes his side will need a great deal of good fortune if they are to continue to taste glory in the last two months of the season.
He told the New Statesman: "The thing about cup football is you need to be the best but you also need a lot of luck and I think it's asking too much for all the games to go your way.
"The one thing I will say is, this squad is the best I have ever had. Every game we play, I feel confident.
"At the moment, every attack fears our defence and every defence fears our midfield and attack. That gives you confidence but it is too tough a call."