Fournier was traded from the Orlando Magic to the Celtics in March, but admitted he struggled with focus and depth perception as he continued to recover from the virus.
“It’s like I have a concussion,” Fournier, 28, told reporters after the Celtics’ 129-119 loss to the Portland Trail Blazers on Sunday.
“At the moment, things are a little better. But at first it’s like the bright lights are disturbing my eyes and my vision is blurry and everything is moving too fast for me.
“Sometimes I really have trouble concentrating and my eyes have trouble focusing on one thing. My depth perception is really bad right now. But I saw a specialist, she did. exercises and I hope it gets better. “
Fournier, who scored 21 points with five rebounds and three assists against the Blazers, has played six games since his return on April 23.
He said he may have “felt a bit like me” in Sunday’s game, but added that the period since his return to the pitch had been “painful”.
“It’s just terrible timing,” Fournier said of the impact of the virus.
“I’m coming here and we have high expectations and ambitions, trying to make a race. For the first time in my career, I have the opportunity to do a really deep run in the playoffs with a team.
“So it’s kind of a golden opportunity for me to finally be with a great team, and the fact that I have Covid and now I feel like that is heartbreaking to be honest.”