The Red Sox are expected to recall Valdez from Triple-A Worcester on Sunday, Ian Browne of MLB.com reports.
Rosters expand to 28 players Sunday, and Boston is slated to add Valdez and right-hander Chase Shugart. Valdez has appeared in 60 major-league games this season, posting a .224/.282/.400 slash line with six home runs and 27 RBI across 189 plate appearances. His addition to the expanded roster boosts the team's infield depth with David Hamilton going on the 10-day injured list Thursday due to a left index finger fracture.