Chelsea legend Gianfranco Zola was back at Cobham on Friday taking in training.
The Daily Express reports Zola, along with another former Blue Graeme Le Saux, was in the dugout at Cobham as they kept a close eye on the squad in training.
Zola has been linked with a return to Chelsea as an assistant to Napoli coach Maurizio Sarri.
Antonio Conte's future at Stamford Bridge remains in doubt after a run of poor performances.
Chelsea have won just two of their last 10 games.