Milwaukee Brewers: Which prospects have to get added to the 40-man roster?

Carlos Herrera, RHP
Carlos Herrera came to the Milwaukee Brewers in 2015 as part of the Adam Lind trade. Herrera has just turned 21 years old, and he’s rated as a top-30 prospect. He spent all of 2018 at Single-A.
Herrera threw 85 2/3 innings, and posted a 5.46 ERA with the Single-A Wisconsin Timber-Rattlers. He struck out 60, walked 48, and was tagged for five homers.
Herrera has a fastball that sits in the low-90s, and a solid breaking ball, but he lacks physical maturity, and needs to develop.
Of all the top-30 prospects that the Milwaukee Brewers have to add to the 40-man roster, Herrera is the most likely to get exposed to the Rule V draft. He hasn’t reached High-A, and has a lot of work to do before he’s ready for the Majors.
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Teams have to carry a Rule V Draft selection for the entire 2019 season to retain their rights. Carrying a pitcher as limited as Herrera for a full season would be a tough ask of a Major League roster. He’ll probably remain off the Milwaukee Brewers 40-man roster, but it’s unlikely that he’s selected given his limited experience, and slight frame.