<P> Each Major League Baseball team maintains both a 25 - man roster and a 40 - man roster of players . Players on the 25 - man roster are eligible to play in official major league games throughout the season . The 40 - man roster includes the players on the 25 - man roster plus as many as 15 players who are either on the team's seven - or 10 - day disabled list, who are on paternity leave for up to three days, or who are in the franchise's farm teams in Minor League Baseball . From September 1 through the end of the regular season, any player on the 40 - man roster (also referred to as the "expanded roster") is eligible to play in an official regular season game . Many young players make their Major League debuts in this way, as "September call - ups ." </P> <P> To be eligible for a team's postseason roster, a player must be on any of the following: (a) the 40 - man roster, (b) the 60 - day disabled list, or (c) the bereavement list as of August 31 at midnight ET . The only exception is that a player who is on the disabled list at the end of the regular season may be replaced on the postseason roster by any other player who was in the organization on August 31, with the approval of the Commissioner . All players on the team's roster during the season will be eligible to receive a World Series ring after the team wins the World Series . </P> <P> Teams may trade only players currently under contract . From the end of the previous World Series through July, trades between two or more major league teams may freely occur at any time . In August, trades may only be made after all players in the trade clear waivers or are not on 40 - man rosters . Players acquired after August 31 are ineligible for the postseason roster unless they replace an injured player . Unlike in the NFL, NHL, MLS, and the NBA, teams may not trade draft choices (with the exception of competitive balance draft selections, which can be traded as explained below), but may purchase the rights to Rule 5 Draft Picks . </P> <P> Beginning with the 2012 season, MLB allows one specific class of draft picks to be traded . As part of a newly signed collective bargaining agreement between MLB and its players' union, each team is allocated a "bonus pool"--a set amount of money it can use to sign its draft picks for that year . Teams that go over their threshold can be penalized by losing one or more future draft picks . Those forfeited draft picks will eventually end up in the possession of small - revenue teams, which can then trade them if they wish . The first picks awarded under this scheme were for the 2013 draft . </P>

Who can be traded after the trade deadline
find me the text answering this question