The Red Sox designated Walter (shoulder) for assignment Tuesday, Gabrielle Starr of the Boston Herald reports.

EDGE Analysis

The move frees up a spot on the 40-man roster for trade-deadline acquisition Lucas Sims. Walter has been sidelined all season with a shoulder strain, an injury he suffered in early March. Assuming he clears waivers, Walter will remain on Triple-A Worcester's 60-day injured list.