Croatia centre-back Domagoj Vida was substituted at half-time in the 3-3 friendly draw with Turkey on Wednesday after testing positive for Covid-19.
Though Vida, along with the rest of the team, had tested negatively on Monday, subsequent tests on the morning of the game resulted in a 'potentially positive result' being returned as the match was unfolding.
As a precaution, the 31-year-old, who plays club football for Besiktas, was taken off at half-time and put into immediate isolation with further testing confirming his positive Covid-19 diagnosis.
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The Croatian Football Federation revealed the coronavirus scare post-match and were quick to stress that they had adhered strictly to all UEFA protocol.