Robertson hasn’t pitched a big league game this season, while the 22-year-old Batista has never pitched in the majors.
Batista had a 6-6 record with a 5.01 earned-run average over 26 games with Houston’s A+ affiliate in Asheville, N.C., last season.
He struck out 103 over 115 innings in that span.
Robertson split time between the St. Louis Cardinals and Toronto last season.
The 26-year-old Robertson pitched one scoreless inning for the Blue Jays in 2024 but had a 4.38 ERA with 14 strikeouts over 12 1/3 innings for St. Louis.
