In August, players can be put on Revocable Waivers. Remember that for a 40 man roster player to be traded after July 31, he has to clear waivers. This is what that refers to. Teams put most of their players on waivers in an attempt for them to clear waivers.
IF they clear waivers, they are still on the 40 man roster and can be traded.
If they are claimed, the Twins have a couple of choices.
First, they could let the claiming team have him and his remaining contract.
Second, they get 48 hours to work out a trade with the team that claimed said player.
Third, the team could pull the player back from waivers.
Example - If the Twins put Joe Mauer on waivers now and the Seattle Mariners claimed him... the Twins could 1.) let the Mariners have him and the 7 years and $150+ million that he's owned, 2.) they could try to work out a trade with each other, or 3.) the Twins could (and would) pull him back.
Now, at that point, the Twins could put the player back on waivers... However, this time, if this player is claimed, they can not pull him back.
With those rules in play, and knowing that most players get put on waivers once, it will be interesting to see who gets claimed.
Would Joe Mauer get claimed by a team, assuming that the Twins would pull him back, but be willing to take on the contract if he weren't?
It's actually a very interesting part of the business side of the game...
Would get claimed - Span, Revere, Willingham, Plouffe, Mauer, Morneau, Parmelee, Dozier, Doumit, Burton, Perkins, Diamond, Burnett...
It should be an interesting month!