Sergio Aguero was taken to hospital after complaining of chest discomfort during Barcelona’s draw with Alaves.
The 33-year-old striker was withdrawn before half-time after receiving treatment for several minutes during the La Liga match at the Nou Camp.
He was seen holding his chest and will undergo cardiac tests at hospital as a precautionary measure, after leaving the ground in an ambulance. He was replaced by Philippe Coutinho.
Confirming the news, Barcelona wrote on Twitter: ” @aguerosergiokun reported chest discomfort and has been admitted to the hospital for a cardiac exam.”
Aguero’s former team Manchester City also sent a message of support and wished the Argentine well.
Barcelona, who were led by caretaker boss Sergi Barjuan for the first time following the departure of Ronald Koeman, were held to a 1-1 draw by Alaves.
Former Manchester United forward Memphis Depay opened the scoring before Luis Rioja levelled to earn a point for the visitors.
Barcelona remain in ninth place in the table – eight points behind fierce rivals Real Madrid, who beat Elche 2-1.