If a club wishes to remove a player from its MLB Reserve List (40-man roster) and send the player to the minors, the club must first secure Outright Assignment Waivers.
For all players on an MLB Reserve List (40-man Roster) other than Rule 5 players, Draft-Excluded players, and injured players, Outright Assignment Waivers can generally be requested anytime in a given waiver period, and they are always irrevocable. The waiver price is $25,000 for Rule 5 and Draft-Excluded players, and $20,000 for all other players.
Once secured, Outright Assignment Waivers remain in effect for a set period of time:
1. Seven days or until the end of the waiver period (whichever comes first) for Outright Assignment Waivers secured September 1st through the 30th day of the MLB regular season:
2. The entire waiver period for Outright Assignment Waivers secured starting on the 31st day of the MLB regular season through August 31st.
3. 72 hours if the player is on Optional Assignment to the minors or on a Disabled List.
If a player on an MLB or minor league Disabled List is placed on Outright Assignment Waivers during the MLB regular season, he must be eligible to be reinstated from the DL and healthy enough to play. If waivers are secured, the player must be reinstated from the DL within 72 hours. If a player on an MLB Disabled List is placed on Outright Assignment Waivers after the conclusion of the MLB regular season and waivers are secured, the player must be reinstated from the DL within 72 hours.
A player who has a "no trade" right (full or partial) must waive his "no trade" right before he can be placed on Outright Assignment Waivers.
A club does not have to outright a player to the minors after Outright Assignment Waivers have been secured.