Probably a tactical decision. Lewy is too slow to make a big impact against a good low-block defense like Atleti has. We'll need younger legs to run and when Atleti's worn out, a fresh Lewy can decide the game, especially if it goes overtime.
I think Flick sees Ferran as the copa striker. He seems to always play Ferran instead of lewandownski in copa and rest of the 11 is gala XI.
So no real surprises. Just a bit worried about Pedri and lamines playing time. Especially lamine who seems to play no matter what. Couldn't see him resting here though. Maybe could have rested Pedri but that would be a risk too ..
Objective for this game is of course going through, but I think we really need to go through without playing 120 mins against atlético again for the sake of the rest of the season..