The Argentine reportedly did not show up for the club's pre-season tests on Sunday as he claims he is not longer an FC Barcelona player.
It has been reported that there was a clause that woud allow Messi to leave Barcelona for free, although the club insists that clause expired in May and any potential suitor will need to pay to the Argentine's €700million buyout clause.
The league has now stepped in claimed the release clause must be paid if Messi wants to leave the Camp Nou.
Statement:
Memphis Depay (Lyon)
Rayan Ait-Nouri (Angers)
Fabian Ruiz (Napoli)
Eric Garcia (Manchester City)
Neymar (Paris Saint-Germain)
Lautaro Martinez (Inter Milan)
Georginio Wijnaldum (Liverpool)
Jose Gaya (Valencia)
Sadio Mane (Liverpool)
Myron Boadu (AZ Alkmaar)