Oller is scheduled to start Sunday's game against the Cubs at loanDepot Park.
Despite being roughed up for five earned runs while allowing nine baserunners over 4.2 innings in his Marlins debut Monday against the Diamondbacks, Oller will be awarded a second turn through the rotation. Oller had earned the call-up to Miami after posting a 2.70 ERA and 0.94 WHIP over his last five outings at Triple-A Jacksonville, but he's still likely to have a short leash in the big-league rotation if he struggles again Saturday.