Pierre-Emerick Aubameyang has tested positive for Covid-19 just four days before Gabon's first game at the Africa Cup of Nations.
The Arsenal star and Nice midfielder Mario Lemina returned positive lateral flow tests on arrival at Yaounde's airport in Cameroon.
Gabon play their opening Group C match against Comoros on Monday.
Aubameyang was recently stripped of the Arsenal captaincy after a disciplinary breach.