Found August 27, 2007 on The Red Sox Outsider:
As far as I know, on September 1st major league teams are allowed to expand their roster by 15 players. That means, potentially, all players on the 40 man roster can be called up. I believe as aprerequisite, you must be on the 40 man roster prior to the first. So lets look at who is currently on the roster but not active.
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