The Marlins are expected to call up Mack from Triple-A Jacksonville on Monday, Craig Mish of FanDuel Sports Network Florida reports.
Mack will get a chance to make his MLB debut during Monday's series finale against the Phillies. The 23-year-old catcher is considered one of Miami's top prospects, and he's slashed .244/.388/.378 with three home runs and one stolen base over 103 plate appearances with Jacksonville this season. Agustin Ramirez is set to be sent down to Triple-A Jacksonville in a corresponding move, so Mack will share reps behind the plate with Liam Hicks for the time being.