Blues goalkeeper coach Christophe Lollichon is working with FCL technical chief Christian Schmidt to help the club's shot-stoppers.
However, the alliance runs deeper, with Chelsea helping FCL develop a data performance system.
"The input comes from Christophe Lollichon, the goalkeeping coordinator of Chelsea," explained Schmidt to Blick.
"Together with Gabriel Wüthrich, coordinator of the FCL junior coaches, we want to improve our goalkeepers. Our keeper is training is using GPS."
On Lollichon, he adds: "If I need help, I turn to him."