Barca won 2-1 at the Metropolitano, with Robert Lewandowski hitting the winner on 87 minutes.
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The veteran Poland striker, 37, is off contract this summer and Flick, after the win, was asked for an update on the player's situation.
"That's looking too far ahead right now. We have eight LaLiga games to play, we need to be focused and ready," insisted the German.
Meanwhile, there's been fresh speculation around Marcus Rashford and Barca's plans to turn his loan from Manchester United into a permanent deal. Rashford opened the scoring for Barca on Saturday.
However, Flick would only offer afterwards: "First we have to focus on this season and then we'll see what happens. He has shown his quality."