Gyokeres especially in the cl is a good target from down the channels. We build attacks better with his channel play than off long balls to Kai. IMO.
I would start Havertz tomorrow.
Reason being is that he gives us the ability to play both short and long.
PSG will press M2M and Kai’s movements, whether that’s out-wide or in deeper areas will create dilemmas. PSG’s CBs will be thinking ‘do I stay or do I jump all the way?’
Moreover, you have the Raya -> Havertz direct avenue too. Seems like a no brainer to me, but let’s see.