As with many professional sports leagues in North America, Major league Rugby allows teams to trade certain assets between each other, such as players (technically, the playing rights of players), draft picks, salary cap space (although the $ amount is not disclosed), and international player slots.

In Major League Rugby, each team starts each season with 10 international player slots. These international slots determine how many non-US/Canada eligible players a team can have in any given matchday 23 (not a limit on how many foreign players a team can have on their entire roster). This is to guarantee playing time for US/Canada eligible players in order to let them develop as much as possible, and strengthen the domestic game.

Team	International Player Slots
	6
	10
	10
	11
	11
	10
	10
	10
	10
	11
	11

The amount of international slots for each team can be seen in the table to the left.

For the 2024 Major League Rugby Season, the total International Player Slot limit across all teams is 121. Typically it would be 120 (10x the number of teams), but the Toronto Arrows had traded one of their international slots away prior to their demise, and rather than punish the innocent recipient of that trade, the slot was kept, so 12×10+1.

On a weekend where every team is playing, a maximum of 121 of the 276 players on matchday rosters (12×23) will not be US or Canada Eligible. This means that at least 155 players, or 56%, are domestic.

For a list of trade transactions by season, please refer to the drop down menu above, or the following links: