Who conceeded most? Well Lukaku finished his second training session with the club and had a session where he turned out to be a Goalkeeper during training.
The sole purpose of the training is to prepare the players in dire Tactical situations where the Goalkeeper might get injured without a ready replacement in the bench just like the Champions League group stages where pep Guardiola was forced to make Kyle walker a Goalkeeper after both Ederson and Claudio bravo went out.
Among the Chelsea Stars that were pictured in training having Goalkeeping sessions were;
Romelu Lukaku, Kai Havertz, Callum Hudson odoi, Jorginho frello.
Kai Havertz on his part looked commited to be at the Goalpost. Maybe in future he would swap places with Kepa arrizabalaga *lol* just joking though.