Several Benfica players, along with members of the coaching staff led by Jose Mourinho, have shown symptoms of a viral infection.
Idman.biz, citing A Bola, reports that those affected are experiencing headaches and muscle pain.
The situation has caused serious concern among the club’s management on the eve of the eighth-round Portuguese league match against Porto.
Earlier, before the Champions League match against Chelsea in London, Mourinho had admitted that he experienced a high fever - at that time, it was believed to be the flu and not a cause for concern. However, the Benfica medical staff is now closely monitoring the condition of the players and coaches, as worries persist.