Walls was added to the Friday's lineup against the Blue Jays and will start at third base and bat ninth, Marc Topkin of the Tampa Bay Times reports.
The 25-year-old was originally absent from Friday's starting nine, but Yandy Diaz was a late scratch due to an illness. Walls is 1-for-22 two walks, two runs, a stolen base and nine strikeouts in his past seven contests.