Scott will serve as Oakland's opening pitcher in Tuesday's game against the Giants.
After being claimed off waivers from Boston last week, Scott made his first two appearances with Oakland out of the bullpen. The 31-year-old will now get the chance to make his first start as a member of the Athletics, though he's unlikely to pitch more than an inning or two before giving way to Ken Waldichuk, who is expected to serve as a bulk reliever.