Chelsea held an open training session for rights-holding media on Wednesday, with Emiliano Martinez and Aaron Anselmino involved, but Moises Caicedo was not present.
Only the first 15 minutes were captured by cameras, so it remains unclear whether midfielder Caicedo joined later or whether the Argentine duo completed the full session.
However, both Martinez and Anselmino have been called up by their national side for the upcoming international break.
Martinez, who suffered a fractured jaw at Everton last month, has been fitted with a protective mask so he can return to play, despite needing more time for the injury to fully heal.
Anselmino, meanwhile, has not featured for Chelsea this season and manager Xabi Alonso revealed last week that he has been carrying an injury.
Jordan Henderson, who had been out due to illness for Saturday's 2-1 win over Manchester United , also returned.
None of Chelsea's other injured players, including Joao Pedro, Reece James and Maxence Lacroix, were spotted in training.


