FRIDAY, 9:10am: Sherman reports that Sheffield demanded to be released or traded to the Marlins.
THURSDAY, 8:48pm: SI's Jon Heyman reports, via Twitter, that the Giants were the team that claimed Sheffield on waivers earlier this month.
6:23pm: David Lennon at Newsday reminds us that earlier this month, the Mets placed Sheff on waivers, but pulled him back when he was claimed. This means he cannot be traded; the Mets could release him or place him on irrevocable waivers and lose him if he is claimed.
5:57pm: Via Twitter, Sherman cites a Mets official who says that "Sheffield has not been released."
5:47pm: Joel Sherman of the New York Post is reporting that Gary Sheffield and the Mets are at odds about his contract situation. Sherman cites "two sources" who say that Sheffield asked the team for a contract extension and was denied. The sources say he is now threatening to leave the team.
The two parties are now in discussions, according to Sherman, and the release of the aging outfielder is "a possibility." Sheffield was pulled from the roster for tonight's game, but Jerry Manuel said he pulled himself "to clear his head."