Major League Soccer announced three "substantial" changes to its roster rules on Thursday.

The modifications go into effect during the current secondary transfer window.

"The new roster rules open the door for clubs to sign additional world-class players and more emerging stars, while also providing a great deal of flexibility to invest across the roster," said Todd Durbin, MLS executive vice president for player strategy and relations.

"We have a unique opportunity with the World Cup coming in two years. These modifications, along with others being discussed for potential implementation in 2025 and beyond, will elevate our league and increase fan engagement around the world."

The first change is that all MLS rosters will now feature six prime roster spots: three Designated Players and three U22 Initiative Players.

Secondly, clubs will now have two different models for roster construction. The Designated Player model follows the three-and-three format listed above. The U22 Initiative Player model allows teams to exchange one of the three DP slots for a fourth U22 slot while gaining up to $2 million in added general allocation money. Teams have until Aug. 14 to declare their path for the 2024 season.

The third change allows teams to convert up to $3 million in total transfer revenues into general allocation money, with no restrictions on the amount from any individual player transfer. Previously, clubs could only convert up to $1.216 million into GAM following a player transfer.

The league said its Sporting and Competition Committee began exploring potential rules changes in early 2023. The process included insights from a survey of more than 25,000 soccer fans in the United States and Canada.

--Field Level Media