A disgraced sports doctor who sexually assaulted gymnasts – including Olympic medallists – has been stabbed multiple times in prison.

Larry Nassar was knifed multiple times during an altercation with another prisoner at a federal prison in Florida on Sunday, sources familiar with the matter told the Associated Press (AP).

The 59-year-old was reported to be in a stable condition.

Nassar a former doctor for USA Gymnastics, was convicted and sentenced to upwards of 300 years behind bars in 2018 after being accused of abuse by more than 250 athletes – including Olympic champion Simone Biles.

Separately, he also pleaded guilty to possessing child pornography.

Nassar was sentenced in federal court in 2017 to 60 years in prison on charges of possessing child sex abuse material.

The following year, he was also sentenced to up to 175 years and up to 125 years, respectively, in two separate Michigan courts for molesting female gymnasts under his care.