Former Premier League midfielder Enock Mwepu was rushed to hospital on Sunday and is undergoing "precautionary checks".
Initial reports in Zambia claimed Mwepu, 25, suffered a suspected heart attack. Brighton have since confirmed the ex-player has been admitted to hospital after falling unwell.
"Enock was taken unwell in Zambia and is currently undergoing precautionary checks," a Brighton spokesperson has told the BBC. "Our medical team is in communication with the hospital to assist if required. The club would like to thank the many well-wishers for their messages and support."