As first reported by BFM Nice Cote d'Azur, the professional footballer stopped on the hard shoulder of the motorway, exited their vehicle and climbed over the barrier.
Police were soon in attendance at the Magnan viaduct, while RMC Sport reported that the Ligue 1 club sent a psychologist to provide support to the player.
In reaction to the incident, Nice cancelled Friday's press conference ahead of their game against Brest on Sunday. Some reporters had already arrived when the decision was made, with the club also holding a crisis meeting.
As reported by Canal+, after just under three hours on the edge of the bridge the player was safely recovered by the emergency services.
Nice have since released a statement on the incident.
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“Above all, we are relieved that everything ended well today for Alexis. He was taken care of. We will continue to respect medical confidentiality and we ask everyone to do the same and respect their privacy. We are in his support as well as that of the entire club,” declared Jean-Pierre Rivère, president of OGC Nice.