Mykhailo Mudryk and Danny Welbeck were among the six players to join up with Chelsea in Hong Kong for their pre-season tour.
Geovany Quenda, Pedro Neto, Mike Penders and Gabriel Slonina also arrived on Monday.
This is the first time Mudryk has been part of team training since December 2024.
The Ukraine international is free to return to football after his anti-doping proceedings were resolved.
New Blues signing Welbeck has been meeting his new team-mates for the first time since his move from Brighton was confirmed.
Neto is reporting back after a short break following his participation at the World Cup with Portugal.