Reed (hamstring) was placed on the 7-day DL on Wednesday with a right hamstring strain, the Houston Chronicle's Angel Verdejo reports.
General manager Jeff Luhnow said the team does not know the severity of the injury or what kind of timetable Reed is facing. He has a .973 OPS and six home runs through 28 games for Triple-A Frisco, despite dealing with some bad luck on balls in play. Reed will almost certainly be up this season, and his ability to return quickly and put this injury behind him will dictate exactly when he gets the call this summer.