“The biggest problem is that Novak and Rafa are so prepared this year and that’s the biggest problem for Fed.
“But he won his most surprising Grand Slam in 17 and miracles still happen in Melbourne for Roger.”
However Eurosport pundit Alex Corretja does not believe skipping the ATP Cup will be detrimental to Swiss star Federer.
Corretja told Express Sport: “Every player has their own feeling and it depends on the player.
“If he is not playing the ATP Cup it is because he is thinking the preparation for Melbourne he needs different competition or different set-up.