Messi's legal team argues he's unilaterally terminated his contract with Barcelona and doesn't need to show up to training, ESPN's Sam Marsden reports.
The 33-year-old already instructed the club's higher-ups Sunday that he wouldn't undergo the necessary coronavirus testing to participate in training.
A court case is now looming over Messi and Barcelona, as the two sides insist on different interpretations of a now-infamous clause in the Argentine's contract that may or may not allow him to leave on a free transfer.
The club reportedly maintains the clause in question expired in June and that any team interested in signing Messi must activate his €700-million release clause.
La Liga backed up Barcelona's version of events, saying in a statement Sunday that it will not sanction a transfer if the buyout fee isn't paid in full.
Barcelona reportedly believe Messi can only leave on a free transfer if he agrees to sit out the entire 2020-21 season.