Manager Blake Butera said Mikolas is scheduled to pitch behind opener PJ Poulin against the Rays on Friday, Andrew Golden of TheBanner.com reports.
Mikolas was initially penciled in to pitch Saturday, but he'll be moved up to Friday after Cade Cavalli (illness) was scratched. Mikolas has fared much better when working in bulk relief this season, as he has a 3.56 ERA, 1.02 WHIP and 22:6 K:BB across 43 innings out of the bullpen.