World champion Cavendish will be trying to defend the sprinter's green jersey he won in Paris last year and then claim Olympic road race gold, while Wiggins is chasing the overall prize at the Tour and the time trial medal in London.
But Dave Brailsford, who divides his time between being British Cycling's performance director and Team Sky's general manager, told the BBC that trying to do all this would be a "recipe for failure".
"We've got four big goals in close proximity and they all revolve around Mark and Bradley," said Brailsford.
"So at this stage of the game you look at what their form is like and, like everything in life, you prioritise.
"I think just to say that you're going to give each one equal significance and try to win everything is probably the recipe for failure.
"What we really need to do is to look at them and say: 'If you could just have one, which one would you take?'
"You then build your chances around that. We're clear in our minds about our approach for this year and it will pan out as we get there."
http://www.bbc.co.uk/sport/0/cycling/17483668
So yellow is the priority for Wiggins and the Olympics Road Race for Cavendish plus stage wins in the Tour presuambly. It makes sense not to target Green as well because that would be asking too much of the Sky helpers who will also have to work for Wiggins.
It does make me wonder what will happen next year. Obviously the Olympics won't be a consideration but it will still be extremely hard to target both Yellow and Green. I won't be surprised if Cavendish (and Eisel) leave Sky at the end of this season. For one thing the length of their contracts have never been revealed.