AS reports that Messi will not be training at Barcelona until he signs a new contract with the Camp Nou club.
The Argentina captain has been a free agent since July 1.
Despite an announcement that the Barca number 10 would sign a five-year contract, the deal is yet to be signed.
Due to Barcelona's financial struggles, Messi has been forced to accept a pay cut in order to remain at the club.
The deal will reportedly see Messi take a 50 per cent pay cut.
Messi's previous contract expired on June 30, meaning that he has been a free agent since July 1 but he is unlikely to agree terms elsewhere.
Messi is currently enjoying an extended holiday after representing his country at the Copa America last month.
The 34-year-old captained Argentina to the title in South America as they beat hosts Brazil 1 -0 in the final.
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