Wojciech Szczesny saw Barcelona thump Champions League opponents Young Boys on Tuesday night.
The former Juventus goalkeeper is coming out of retirement to sign for Barca.
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Szczesny was seen in conversation with Ferran Torres and Ronald Araujo as he took in the game.
The Pole will sign for Barca as cover for Marc-Andre ter Stegen, who is out for the season with a knee injury.
He was due to undergo his medical on Tuesday with an announcement over his signing imminent.