Walker was placed on the 45-day injured list Friday with a right shoulder impingement.

The 25-year-old suffered the injury early in spring camp and was never provided an official timetable for his return, but he clearly needs more time to recover. Walker made his big-league debut in 2019 and allowed two runs over 9.1 innings, but it's unclear if he'll be able to play during the shortened 2020 season.

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