FIFA have stepped up the pressure on SFA by asking them why they have blocked the moves of seven former Rangers players, including Everton's Steven Naismith.
Fifa have given SFA seven days to respond in writing so the players can start playing matches for their new clubs.
The players lawyer Margaret Gribbon said: "Following the refusal of the SFA to issue players registrations, the new clubs have all referred the matter to FIFA.
"FIFA have now written to the SFA in each case requesting reasons why the players' registrations were blocked.
"It remains entirely unclear the facts and matters upon which Rangers oldco and Rangers newco rely in order to support their position that the players acted in breach of contract.
"Presumably they have made their reasons known to the SFA and if so, these have not been shared with my law firm, Bridge Litigation, who represent the majority of the players.
"FIFA have given the SFA seven days to respond but it is hoped that given the straightforward nature of the request the SFA will be in a position to reply sooner.
"We remain confident that FIFA will grant ITC (International Transfer Clearance) enabling the players to continue playing football with their new clubs."
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