The league's secondary transfer window opens on Tuesday, July 10 and runs through August 8.
The transfer window allows MLS teams to request the transfer certificate of a player under contract in another country.
Teams can still make trades that do not involve players – that is: swap draft picks, roster spots, allocation money and other assets – outside the two windows. Clubs may also transfer or loan their players to non-MLS clubs at any time, subject to the transfer window of the recipient club's national federation and subject to the consent of the player.
"Per FIFA regulations, MLS teams are able to request International Transfer Certificates (ITC) from players' former clubs to complete signings, loans and transfer deals.