Tonight at midnight (EST) is the deadline to add a current minor league prospect in a team's system to the 40-man roster for the purpose of protecting him from the Rule 5 Draft (which is held on the last day of the Winter Meetings - this year on Dec. 12th). With the imminent re-signing of Javier Lopez, the Giants currently have 38 players on their major league 40-Man Roster.
So, Sabean can add up to 2 current unprotected minor league prospects onto the 40-man sometime today. IMO, the only guy that Sabes will protect today is Gary Brown. Sabes has to be disappointed in his progress the last 2 seasons, but he'll want to protect the ~$1.5M he has invested in Brown so far - and I do think that Brown would be very, very likely to be plucked away from the Giants in 3 weeks if he were available in the Rule 5.
Below is the list of prospects that the Giants must put on their 40-man roster before the midnight or they will be available to other teams during this December's Rule 5 Draft. The first 5 guys (denoted by being above the "===" line) are the prospects that I think have anywhere from a "very likely" to a "slightly possible" chance of being put on the 40-man roster. I've listed these 5 names in the order of what I think are the most- to least-likely to be placed on the 40-man roster by Sabean. Tose names below the "===" line have no chance at a 40-man roster assignment, IMO, and I've listed them in alphabetical order - with the first-time eligible guys being listed first. An "*" after any name means that this is their first time being eligible for the Rule 5 draft.