Major League Baseball rosters Information & Major League Baseball rosters Links at HealthHaven.com

The Major League Baseball roster is a maximum number of players for each team.

Currently there are two different rosters in play for a Major League club: the 25-man roster (also known as the active roster) and the 40-man roster (otherwise known as the expanded roster).

The 25-man roster comprises all the players who may take the field (or "dress") in a game at any given time. Typically, only players on the 25-man roster accompany the club on road trips.

The 40-man roster comprises all of the players on the 25-man roster, plus anyone who is on the 15-day disabled list, and contracted players on "optional assignment" in the minor leagues. A player not on a major-league 40-man roster as of November 20 may be eligible for the Rule 5 draft. From September 1 until the end of the regular season, teams use expanded rosters, so they are allowed to have anybody from the 40-man roster play in games during that final month. Players who have spent much of the season in the minor leagues until this date are often known as "September callups."

A non-roster invitee is a player invited to participate in a particular Major League team's spring training without having a spot on that team's 40-man roster. Some non-roster invitees are well-regarded prospects who are given the invitation so that they can face high-level spring competition and receive instruction from the parent team's coaching staff. The majority, however, are veterans who for reason of past performance or injury were unable to attract an offer of a guaranteed contract with a major league club. Non-roster invitees are always under some type of contract for insurance reasons, as teams would risk incurring liability if an unsigned player were injured at their facility. It is a minor-league contract which, in the case of a veteran player, generally has a 'two-way' salary option in place in the event that the player is activated by the major-league club during the given season.

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