The 2012 Tour de France winner and Olympic time trial champion was not selected by TeamSky for Spain’s grand tour, where they are focusing their efforts on Chris Froome.
Froome, victorious in France 12 months on from Wiggins’ success, was the team leader once more this summer but failed to complete the race, after fracturing his wrist.
He has recovered to lead the team in Spain, meaning Wiggins is again surplus to requirements.
“My plan was to do two weeks there like (Omega Pharma-Quick Step rider) Tony Martin does,” Wiggins told The Guardian.
“But Sky are in the Vuelta to win it now and if they were leading the race and I had to pull out with a week to go, that wouldn’t be right.”
His absence allows him to commit to his home event, which runs from September 7 in Liverpool until September 14 in London.
Having taken advantage of a mid-race 10km time trial stage to win last year’s event, he said: “It will be good to be there with the number one on my back, because I didn’t get to do that with some of the other stage races I’ve won.”
Wiggins is also targeting the world time trial championship 10 days later, aiming to end Martin’s three-year winning run on a testing course in Ponferradina, Spain.
“This year it’s more rolling, and hillier in the finale so I’ll have a better chance,” he said.
“It will be the same three or four riders again — (2009 and 2010 winner) Fabian Cancellara, Tony, Chris and me — and on any given day, it can be any one of us.
“It would be nice to finish my career with a world title on the road, but when I come back to it, the proudest day of my career was the time trial in London. Not everyone gets the opportunity to win the Olympics.”