"Two sources tell Matt Cerrone of MetsBlog.com that MLB's review of Oliver Perez's medical records is not a formality.
In other words, MLB is taking it very seriously. In fact, there is even a chance that the transaction gets reversed. The roster move was curious timing, of course, as the Mets were hoping to convince Perez to accept a minor league assignment. He ended up being placed on the disabled list with right patella tendinitis. Stay tuned, because it sounds like this might not be the last we hear of this situation."