Larry LaRue of the News Tribune is reporting that 2B Luis Valbuena and lefty starter/reliever Justin Thomas will be joining the club tomorrow as the first September callups, and will be joined shortly after by starter Brandon Morrow, relievers Mark Lowe and Jared Wells, and catcher Rob Johnson.

There is a consensus that third baseman Matt Tuiasosopo will be brought up as well.

Valbuena, Thomas and Tuiasosopo are all absent from the 40-man roster and will have to be added before being called up.  There are only 39 players currently on the 40-man roster, meaning two spots will have to be cleared.  The absolute easiest way to do this would be to transfer both Mike Morse and Willie Bloomquist from the 15-day DL to the 60-day DL.  Beyond that, in order to remove someone from the 40-man roster the team has to either pass them through waivers or release and re-sign them to a minor league deal, if I remember the rules correctly (and I’m not 100% confident that I do).