The Argentine picked up a slight injury in training on the club’s pre-season tour to the Far East, which was later identified as a thigh strain.
The Catalan club have confirmed that he has performed rehabilitation work with his physiotherapist and remains a doubt.
Barcelona are set for a busy start to the new campaign, with three League games and two Supercopa de Espana matches in the first two weeks.
Boss Tata Martino will be reluctant to take any risks with his star forward, Messi, who will not be rushed back until he is fully fit.
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