Chelsea are watching Montpellier defender Nordi Mukiele.
L'Equipe says there were dozens of scouts in attendance for their recent clash with Paris Saint-Germain.
And among them were Chelsea.
Mukiele has been a long-term target for RB Leipzig, while Roma are also known admirers, and a transfer before the January window ends is not being ruled out.
It was a difficult evening for the 20-year-old in front of the prestigious on-lookers.