Sergio Aguero, Barcelona's striker, has been declared ineligible for three months following a cardiac examination.
After suffering chest pains during Saturday's first-half draw with Alaves, Barca's 1-1 draw with Alaves, the 33-year old was taken to hospital for tests on their heart.
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According to the club, Aguero had undergone a cardiac examination and was able to undergo a diagnostic as well as therapeutic procedure with Dr. Josep Braga.
"Over the next three month, the effectiveness of the treatment is being evaluated in order to determine when he can return."
Since joining Barca on a free transfer this summer from Manchester City, Aguero has made five appearances. His only goal came in the final seconds of their 2-1 loss against Real Madrid in El Clasico.
Barca's situation with Aguero is compounded by the fact that they are currently being managed by Sergi Barjuan, interim coach following the sacking Ronald Koeman. ESPN has been informed by sources that Barca is in discussions to appoint Xavi Hernandez, the club's legend and Al Sadd coach.
Barjuan stated Monday that Aguero was an important player and that his absence is a setback.
"I spoke with him, we exchanged WhatsApps and he is now calm. He is still in his hospital room, he said he was locked there but he is calm.
Aguero will also be absent from Argentina's World Cup qualifiers against Uruguay and Brazil this month.
On social media, Aguero received messages of support from club teammates. Pedri, a midfielder, posted a photo of Aguero to Instagram with the message "We are with Kun Aguero." Captain Sergio Busquets also wrote: "Come on Kuni."
Barca will next travel to Dynamo Kiev for a crucial Champions League match as they fight back from their September defeats to Benfica and Bayern Munich. Due to a calf injury, the side are also without Gerard Pique, a defender.
