Six minors are still with top Laos side Champasak United,
after it imported 23 under-age players from West Africa to an unregistered
football academy in February, a BBC investigation found.
Fifa regulations prohibit the movement of players to a
foreign club or academy until they are 18.
The club, based in the southern city Pakse, denies any
wrongdoing.
"Fifa is in contact with several member associations in
order to gather all information to assess the matter and safeguard the
interests of the minors," a Fifa spokesperson told the BBC.
Global players' union FIFPro, which helped release 17 of the
23 players three months ago, said in a statement it "suspects this case is
not one of its kind, but probably the tip of the iceberg".
It has been claimed that Champasak United, a newly-formed club
which plays in Laos's top league, intends to profit by selling the players in
future.