The Blues have endured a miserable start to their Premier League title defence and speculation is rife that in-fighting has been partly to blame.
talkSPORT reporter Stan Collymore suggested that Terry and Costa had clashed during a training session but then apologized for the claim.
Jose Mourinho’s side have suffered three defeats in their opening five Premier League fixtures. the same number of losses Chelsea racked up through the entire 2014/15 season, and find themselves 11 points off early season pace-setters Man City.
Chelsea will hope to get their season back on track with a win over Israeli side Maccabi Tel-Aviv on Wednesday night.