The deadline for Major League teams to set their 40-man rosters in advance of next month’s Rule 5 Draft is tonight at 8pm ET. As such, baseball fans should expect to see a flurry of activity over the next 11 hours. There will be likely be players designated for assignment, outrighted and claimed off waivers in addition to multiple smaller-scale trades as teams make room on their own 40-man rosters and also pick up fringe 40-man candidates out of other organizations.

The Rule 5 Draft will take place on the final day of next month’s Winter Meetings (Dec. 13) and allow clubs with open space on the 40-man roster to select certain players not on the 40-man roster out of other organizations. Rule 5 eligibility is dependent on the age at which a player signed and that player’s experience.

A player that signed at 18 years of age or younger and has five seasons of pro ball with is Rule 5 eligible if he is not added to the 40-man roster today. Players that signed at 19 or older and have four seasons of professional experience are also eligible to be selected if they’re not added to the 40-man roster today. (In other words, college draftees out of the 2015 class, high school draftees out of the 2014 class and most international amateurs signed in the 2014-15 international period are eligible this year if not protected.)

MLB.com’s Jonathan Mayo has a rundown of the players in each team’s top 30 prospect rankings who need to be protected today or else be exposed to potential Rule 5 selection. Of particular note, eight prospects who find themselves on MLB.com’s top 100 prospect rankings need protection, though there’s virtually no chance that any from that bunch are left off their respective rosters. Readers will also want to check out an exhaustive team-by-team look at some candidates to be added to each team’s 40-man roster, courtesy of Jason Martinez of MLBTR and Roster Resource, as well as a team-by-team look at each club’s decisions from the staff over at Baseball America.

Here’s a quick rundown of the number of open 40-man spaces each team presently has to work with as of this morning:

American League West

American League Central

American League East

National League West

National League Central

National League East

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