The 28-year-old rider, who won the last BMX race event at Rio 2016, was one of the favorites to clinch gold in Tokyo.
However, his third Games were cut short after he appeared to get tangled up with another participant in round three of the BMX Racing men’s semi-final at Ariake Urban Sports Park.
He was transferred to the intensive care unit at St Luke’s International Hospital, but is now in rehabilitation in Salt Lake City.
“I’m improving a little bit every day that’s all I can ask for,” he said in the post. “I am so grateful to my team of people for their endless support.”
Fields has confirmed he will not be attending the BMX World Championships, but said he “can’t wait to watch the races”.
The competition, which will take place in the Netherlands, is scheduled to start on August 21 and end on August 22.
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