After being involved in a serious car crash earlier in the week, the midfielder may never play professional football again.
Anin was in the backseat as the driver of the car fell asleep just before midnight on Monday, resulting in it sliding off the road and turning over several times.
Reports suggest the Nice midfielder may lose the use of his legs following the accident. Riviere would not confirm those stories, but he was not optimistic for the former Le Havre player.
“I’m not here to announce a diagnosis. It is not my role,” he told the club’s official website. “The only certainty is that the accident was serious and the consequences on the life of Kevin will be great.
“It is not his career that preoccupies me, it is his health. The club will be there for him. Kevin is one of us.”
Anin, who attracted the interest of Arsenal two years ago, was beginning to get his career back on track after a well-publicized bout of depression saw him miss much of the first half of the Ligue 1 campaign.