The Pirates acquired Shugart from the Red Sox on Friday in exchange for Matt McShane, Robert Murray of FanSided.com reports.
The Red Sox designated Shugart for assignment Wednesday, Hunter Noll of Beyond the Monster reports.
Shugart walked two batters in two-thirds of an inning Tuesday to record his first career save in Tuesday's 6-5 extra-inning win over the Blue Jays.
The Red Sox recalled Shugart from Triple-A Worcester on Monday, Jen McCaffrey of The Athletic reports.
The Red Sox optioned Shugart to Triple-A Worcester on Sunday, Pete Abraham of The Boston Globe reports.
The Red Sox recalled Shugart from Triple-A Worcester on Sunday.
Shugart is expected to be added to the Red Sox's roster Sunday, Christopher Smith of MassLive.com reports.
The Red Sox optioned Shugart to Triple-A Worcester on Friday, Gabrielle Starr of the Boston Herald reports.