Premier League players will be blocked from switching sides before the delayed end of the campaign – even if they are out of contract at their respective clubs.
And Fifa are already considering a one-off, third transfer window next season because the summer trading spell will be so short.
Fifa’s legal director Emilio Garcia Silvero conceded they cannot demand contracts that expire in June be extended beyond that period.
But he said they will simply refuse to ratify any attempts to register with another team until the 2019-20 campaign has been either completed or closed officially.
That will avoid players moving to another team for the conclusion of the season.
Garcia Silvero said: “Fifa cannot extend the contracts beyond June 30 but the transfer windows will not be the same and the players will not be able to be registered. “It means the market will not open on July 1.
“And if a loan ends on June 30, the player should return to his club but the window would not be open and the return transfer would not be processed.”
The summer transfer window normally starts from July 1 to the start of September, with the other for only the month of January.
But in the 2020-21 campaign, a third transfer window is set to be introduced, possibly in October or November.
Fifa regulatory director James Kitching said: “This would be dealt with flexibly, as long as the total 16-week transfer period is not extended.”
