The best way forward is that Ferran and Lewa split their minutes, Ferran plays for 60 minutes and Lewa the last 30 but I have a feeling Lewa won't be happy with that very soon.
It's going to vary throughout the season, likely a 50/50 split. I don't think Lewy will be upset with that considering his age.
But it depends, things can change. It depends on the players performance and how Hansi sees it.

