Minor League Rehabilitation Assignment

MLB: Per Article XIX-C of the CBA and with the player's consent, a player on the MLB 10-day,15-day, or 60-day Injured List may be assigned to a minor league club for rehabilitation purposes for up to 20 days (for "position players") and up to 30 days (for "pitchers" and for "two-way players"), and a player on an MLB 7-day Injured List (acute concussion) may be assigned to a minor league club for rehabilitation purposes up to five days (for "position players") and up to eight days (for "pitchers" and for "two-way players").

With approval of the MLB Commissioner, a player who has undergone elbow UCL reconstruction surgery (so-called "Tommy John surgery") may have his Minor League Rehabilitation Assignment renewed for up to 30 additional days (in the form of three ten-day renewals).

With approval of the MLB Commissioner, a player on an MLB Active List who has undergone elbow UCL reconstruction (so called "Tommy John surgery") can be temporarily assigned as a "pitcher" to a minor league club for rehabilitation purposes while remaining eligible to play in MLB games as a position-player.  

With approval of the MLB Commissioner, if a player incurs a new (different) injury or illness or suffers a recurrence of the previous injury or illness while on a Minor League Rehabilitation Assignment, the player must be recalled from his Rehab Assignment and remain inactive for at least five days (for "position players") or seven days (for "pitchers" and for "two-way players") before starting another Minor League Rehab Assignment. 

A player on an MLB Injured List who is assigned to a minor league club for rehabilitation purposes continues to accrue MLB service time, and does not count against the minor league club's Active Roster.

A player on an MLB Injured List cannot be assigned to a minor league club for rehabilitation purposes while the player is on Outright Assignment Waivers.  

There is no limit on the number of MLB players who can be on an Article XIX-C Minor League Rehabilitation assignment with the same minor league club at the same time.

MINOR LEAGUES: A player on the 7-day or 60-day Injured List of a minor league affiliate may be assigned to a single-A affiliate of a lower classification or to the MLB club's Spring Training Complex for rehabilitation purposes. No more than three minor league players may be on a Rehabilitation Assignment with a given affiliate at the same time, but there is no limit on the number of minor league players who can be on a Rehabilitation Assignment at the MLB club's Spring Training Complex.   

A player on an MLB Reserve List (40-man roster) who is placed on a minor league injured list after being optioned to the minors cannot be assigned to a Rehabilitation Assignment while the player is on Outright Assignment Waivers.  

With approval of the MLB Commissioner, a minor league player who has undergone elbow UCL reconstruction surgery (so-called "Tommy John Surgery") may have his Rehabilitation Assignment renewed for up to 30 additional days (in the form of three ten-day renewals).

With approval of the MLB Commissioner, if a minor league player incurs a new (different) injury or illness or suffers a recurrence of the previous injury or illness while on a Rehabilitation Assignment, the player must remain inactive for at least five days (for position players) or seven days (for pitchers) before starting another Rehab Assignment. 

A minor league player on a Rehabilitation Assignment with a single-A affiliate does not count against the Reserve List or Active Roster of the club to which he is assigned. (There is no roster limit at the MLB club's Spring Training Complex).