Schultz was selected by the Brewers in the 14th round of the 2019 first-year player draft. The 23-year-old product pitched with the rookie-level Rocky Mountain Vibes in 2019, going 1-3 with a 3.86 ERA and a 1.41 WHIP.
Schultz appeared in nine games for the Brisbane Bandits of the Australian Baseball League in 2020, where he posted a 3.29 ERA with 17 strikeouts over 13.2 innings of work.
Fisher suffered a left hamstring strain during a spring training game and has been on the 10-day injured since opening day. The 27-year-old hit .226 with seven RBIs in 16 games with the Blue Jays in 2020.