In this file photo taken on January 14, 2017 Gabon s forward Pierre-Emerick Aubameyang reacts during the 2017 Africa Cup of Nations group A football match between Gabon and Guinea-Bissau at the Stade de l Amitie Sino-Gabonaise in Libreville (AFP)
Aubameyang was released by Gabon's national team after being diagnosed with "cardiac lesions'' in tests conducted by Confederation of African Football medical officials, who were checking on his condition after he tested positive for COVID-19.
"We haven't had any clarity from the Gabon national team about the reasons why he came back," Arteta said.
"It's our obligation to make sure, medically, the player is safe, in a good condition and there are not any issues related to that. Because historically everything we have done with the player, he has never had that issue.''
While the African federation announced Aubameyang and teammate Mario Lemina had heart lesions, Gabon coach Patrice Neveu said neither player had serious heart problems but rather they were suffering from some aftereffects of COVID.
They tested positive for the virus at an airport in Cameroon on their arrival for the African Cup, forcing them to miss Gabon's first game while in isolation. They also missed the team's second game after CAF's medical commission advised that they shouldn't play following the tests.
Aubameyang was stripped of the Arsenal captaincy last month for disciplinary reasons. He was also left out of some matches before being allowed to join up early with Gabon's squad ahead of the African Cup.
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