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Major League Soccer's secondary transfer window, the second of two periods on the calendar in which teams can register new players via international transfers or intra-league trades, officially opens today.

The secondary transfer window, which runs through Aug. 8, will be the last chance for MLS teams to complete incoming transfers and trades for the 2018 season. The primary transfer window was open from February 7 to May 1.

Teams can announce incoming transfers and trades outside of the transfer windows whenever the paperwork is official, but a player cannot officially be put on a club's roster until his International Transfer Certificate (ITC) is transferred, which must happen within one of the two transfer windows. Although players cannot participate in an official MLS game until their ITC is transferred, they are able to participate in preseason. During the MLS season, intra-league trades involving players can only happen within the windows.

Teams can still make trades that do not involve players – such as 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.

The transfer windows – the dates between which MLS may request the (ITC) of a player under contract in another country – are as follows:

  • Primary Transfer Window | Feb. 7 – May 1, 2018  
  • Secondary Transfer Window | July 10 – Aug. 8, 2018

Click here for full MLS roster rules and regulations.