The 35-year-old Argentine World Cup winner left Barca in 2021 when the club could not afford to renew his contract, and his PSG deal expires in June.
Goalkeeper Szczesny's double save from a penalty in first-half stoppage time kept Poland in the match against a Saudi side that was always on the attack.
Barcelona attempt to establish themselves once again as a force in La Liga and the Champions League while facing an economic crisis caused by loss of revenue due to Covid and mismanagement.
The Polish striker was unhappy with the salary offered by Bayern and had clashed with the Bavarian club's coach Julian Nagelsmann over tactical choices.
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