In baseball, the disabled list (DL) lists players on the team's official roster who cannot play due to injury. When players are placed on the DL, the baseball team is allowed to temporarily add other healthy players to the roster. Players can be placed on the 15-day or 60-day disabled list, depending on the nature and/or the recovery time of their injury.
When placed on the 15-day DL, a player is not considered to be on the 25-man active roster. When placed on the 60-day DL, a player is not considered to be a part of either the active roster or the broader 40-man roster, although the 40-man roster must be full in order for this to occur. In 2011, MLB instituted a new rule that introduced a seven-day DL, specifically intended for head injuries and concussions, in order to protect players from sustaining long-term brain damage. The DL is often used strategically by teams, to replace a mildly injured and underperforming player with a fresh player, thus increasing their odds of winning. Players transferred to the DL in this fashion are often sent to the minor leagues for rehab assignments.