Great performance. His workrate is phenomenal. Exactly why he should have started against Lyon, but let's forget about that pain now.
So many times he tracks back and it forces the opposing player to check their attack. That gives time for everyone else to recover positionally. We looked incredible in that first half, so balanced. Rodri and Ferny were mopping up anything that came past the front 4 (KDB as part of that). Walker and Mendy were tight to the wolves wingers to stop them turning or getting in behind and Stones and Ake then had it fairly easy and dealt with anything they had to really well.
Foden can play in the middle too, depending on the opposition. If you replace Ferny with him and bring Torres in the wide role then you just have even more energy in there. It would just be about ensuring Foden/De Bruyne didn't both press the same areas.