Valverde's 2017 season, one of the best in his career, was cut short in July when he sustained a serious knee injury in a crash during the opening time trial at the Tour.
"With the signings the team made, with (Mikel) Landa (fourth overall this year despite riding in support of Chris Froome), and Nairo (Quintana)... I don't want (to do) the Tour," Valverde told Spanish daily El Pais on Monday.
"I will dedicate myself to the Giro, the Vuelta and the world championships which will be very hard."
The 37-year-old Valverde, third overall in the 2015 Tour, is likely to be among the leading favourites for the world title on a mountainous circuit in Innsbruck, Austria.
He has six medals at the world championships between 2003 and 2014, but has never won gold.
(Reporting by Julien Pretot,; Editing by Ed Osmond)
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