Szczesny recently announced his retirement this summer after representing Poland in Euro 2024, but has surprised fans by making a comeback to play in La Liga for the first time.
The goalkeeper had said his "heart (was) not there any more" to play football after leaving Juventus by mutual agreement in August.
Szczesny has made over 600 appearances for club and country over his career, winning three Serie A titles and three Italian cups with Juventus, as well as two FA Cups with Arsenal.
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Barca's reserve goalkeeper Inaki Pena started in place of the stricken Ter Stegen in recent matches.
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