Jose Mourinho has confirmed Diego Costa was taken to hospital with a rib injury suffered during Chelsea's Capital One League Cup match at Stoke City on Tuesday.
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Costa was injured after a challenge by Stoke midfielder Charlie Adam and was forced off the field after 32 minutes.
Asked in his post-match press conference what the situation was with Costa, Mourinho replied: "He is in the hospital - I don't know."
Holders Chelsea were knocked out of the League Cup by Stoke in penalties.