Wedington on Twitter Saturday wrote: "I got contact traced, I tested negative for COVID.''
With Mills out, Stanford is expected to start junior Jack West. In four career appearances, West has completed 16 of 37 passes for 147 yards without a touchdown. He started one game last year, a 34-16 loss to UCLA.
An Alabama native, West was ESPN's No. 7-ranked pocket passer in the Class of 2018.
The game is set to begin at 7:30 p.m. ET on ABC and the ESPN App.