The Red Sox have placed Daniel Bard, Mark Melancon and Clayton Mortensen on revocable waivers, Nick Cafardo of the Boston Globe reports (on Twitter). The Red Sox have placed many players on waivers since the current waiver period opened at the beginning of August; this is by no means an indication that they intend to trade more players.
If the right-handers go unclaimed, the Red Sox would be able to trade them to any team (the players wouldn’t be eligible for postseason rosters). If a team claims one of the players, the Red Sox will have three choices. They can let the player (and his contract) go to the claiming team, they can complete a trade with the claiming team, or they can pull the player back off of waivers. American League teams will have claiming priority on the three Red Sox pitchers.