The 2012 Tour de France champion has conceded that Team Sky are building their team around last year's winner Chris Froome and that he's bitterly disappointed about being left out.
"I think I can tell you that as things stand I will not be riding in the Tour," he told L'Equipe after being left out of Sky's team for the traditional Tour warm-up, the Criterium du Dauphine.
"After Paris-Roubaix and the Tour of California, I felt good physically, I was ready to go [to the Tour]. But these last few weeks, it has become more and more clear that unless something happens to Froome at the Dauphine, I will not be at the Tour. There we go.
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"All season I have tried to prepare myself for it. It's disappointing because it could have been my last Tour de France. The option they (Team Sky) gave me was to return to the track, to focus on the Commonwealth Games at the end of July."
Froome and Wiggins have a frosty relationship despite Froome having supported Wiggins during his 2012 success.
Wiggins had hinted that he would be willing to return the favour this summer, but now admits that won't happen.
"I could be in the team and help Richie (Porte), for example. But if something happens to one of the other squad members, it won't be me who replaces him," he said.
"To be honest, I've had my doubts since April. I hoped my performances would get me a place. But then, after California, I knew that they were all off on an altitude camp [in Tenerife], but I wasn't involved, nor was I involved in the Tour reconnaissance rides [in Yorkshire last weekend and then in northern France]. So I knew that, realistically, I wouldn't be there."
Kenya-born Froome suggested on Monday that he would prefer Australian Porte as his number two as he seeks to defend his Tour de France yellow jersey.
"Talking about a Plan B, that's a decision the team needs to come to, and Bradley has been talking about playing a support role, not being our Plan B as such," Froome, 29, told the Daily Mirror newspaper.
"Richie is looking pretty good at the moment and has the potential to be riding for a place on the podium.
"As far as Bradley is concerned, the final nine riders selected to start the race in Yorkshire is a hot topic.
"That's going to come down to what is best for the team, who is best for each role and the team dynamics."
Porte, 29, played a key support role in Froome's Tour de France victory, acting as his main climbing deputy in the major mountain stages.
Wiggins missed the chance to defend his title last year because of injury.
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