Chelsea head into 2015 with the possibility of completing a unique quadruple.
The Blues may no longer be able to match the Arsenal Invincibles of 2003/04, but they can arguably topple such a feat by winning a unique quadruple.
Jose Mourinho’s side currently sit at the top of the Premier League table despite a wobble over the festive period including a 5-3 defeat at Tottenham Hotspur.
Aside from the league ambitions, the Stamford Bridge outfit have reached the League Cup semi-final and entertain Paris Saint-Germain in the last 16 of the Champions League.
On the three trophy fronts it has been a case of so far so good - but can the same be said of the illustrious FA Cup?
The West Londoners are big favourites to dispatch Watford and reach round four, yet Desailly feels England’s oldest cup competition will ultimately prove a step too far.
“If any team can win all the trophies, it is Chelsea. But it will be very, very hard. No one will be happier than me if they achieve it, but I honestly think it cannot be done,” the Frenchman told The Mirror.
“It [The FA Cup] means so much to the other clubs. You depend so much on how fortunate you are with the draw. Yes, you can have it easy. But it can also be very, very hard.
“Imagine that you come back from a Champions League game in midweek and have to face one of the big clubs away from home.
“And it can be just as hard if you face one of the smaller clubs if it is not at your ground. They will give everything. They show a lot of fight and spirit because it means so much to them.
“You have to hope that the players, who are not usually regulars, come in and do the job. That is not easy.
“Their great advantage is that all the players know the system that Mourinho wants to play. Everybody knows their role in the team. They are like a well-oiled machine. I love the way they play.
“But the schedule is very tough. And the FA Cup can be a very hard trophy to win. I know because I won it.”