Powell was released by the Reds on Monday.
Powell was named to Cincinnati's 60-man roster pool Sunday.
Powell agreed with the Reds on a minor-league contract earlier this month, Chris Hilburn-Trenkle of Baseball America reports.
Powell went 2-for-2 with a solo home run, two walks and a stolen base for Triple-A El Paso on Sunday, Bill Center of Padres.com reports.
Powell signed a minor-league contract with the Padres on Thursday that includes an invitation to spring training.
Powell was outrighted to Triple-A Nashville on Saturday, Susan Slusser of the San Francisco Chronicle reports.
Powell was reinstated from the 60-day disabled list and sent to Triple-A Nashville on Wednesday.
Powell (knee, thumb) will resume on a rehab assignment with Triple-A Nashville in the coming days, Susan Slusser of the San Francisco Chronicle reports.
Powell (knee, thumb) has been sidelined for more than a week at Triple-A Nashville after suffering a thumb injury, Susan Slusser of the San Francisco Chronicle reports.
Powell (knee) went 2-for-4 with a walk and a run in Triple-A Nashville's win over Round Rock on Thursday.