Ecuele Manga, 27, last featured for Cardiff in their 2-1 defeat at Fulham.
"It might be the case that he has malaria. He is out of hospital and will be commencing training later this week," manager Russell Slade told BBC Radio Wales.
"That is good news, having suffered a virus of that kind of capacity. We see it all at Cardiff City."
Cardiff City centre-back Bruno Ecuele Manga is recovering from malaria having been released from hospital.