Photo: Tasos Katopodis/GettyBarry Sanders has tested positive for COVID-19.The former Detroit Lions star and NFL Hall of Famer, 53, revealed on Twitter Friday that he contracted a breakthrough case of COVID-19 and is asymptomatic.Sanders said he’d stay quarantined until doctors cleared him, and that he expects to be back to normal and rooting for the Lions as a team ambassador at the Sept. 12 game against the San Francisco 49ers.“Despite being double vaccinated, wearing a mask, and taking all the precautions I could… I tested positive for COVID,” hetweeted. “I don’t have any symptoms, but am staying in until I get the green light from the Docs. I will be ready to go for @49ers on 9/12 @Lions @NFL.“Want to get the biggest stories fromPEOPLEevery weekday?Subscribe to our new podcast,PEOPLE Every Day,to get the essential celebrity, entertainment and human interest news stories Monday through Friday.According totheDetroit Free Press, all coaches for the Lions plus over 90 percent of the team’s players are vaccinated, and the team has three players on their COVID reserve list for backups.Breakthrough cases — COVID-19 infections that occurin people who have been fully vaccinatedagainst the virus — are rare, but possible and expected, as the vaccines are not 100% effective in preventing infections. Still, vaccinated people who test positive will likely be asymptomatic or experience a far milder illness than if they were not vaccinated.The majority of deaths from COVID-19 — around 98 to 99% —are in unvaccinated people.

Photo: Tasos Katopodis/Getty

Barry Sanders

Barry Sanders has tested positive for COVID-19.The former Detroit Lions star and NFL Hall of Famer, 53, revealed on Twitter Friday that he contracted a breakthrough case of COVID-19 and is asymptomatic.Sanders said he’d stay quarantined until doctors cleared him, and that he expects to be back to normal and rooting for the Lions as a team ambassador at the Sept. 12 game against the San Francisco 49ers.“Despite being double vaccinated, wearing a mask, and taking all the precautions I could… I tested positive for COVID,” hetweeted. “I don’t have any symptoms, but am staying in until I get the green light from the Docs. I will be ready to go for @49ers on 9/12 @Lions @NFL.“Want to get the biggest stories fromPEOPLEevery weekday?Subscribe to our new podcast,PEOPLE Every Day,to get the essential celebrity, entertainment and human interest news stories Monday through Friday.According totheDetroit Free Press, all coaches for the Lions plus over 90 percent of the team’s players are vaccinated, and the team has three players on their COVID reserve list for backups.Breakthrough cases — COVID-19 infections that occurin people who have been fully vaccinatedagainst the virus — are rare, but possible and expected, as the vaccines are not 100% effective in preventing infections. Still, vaccinated people who test positive will likely be asymptomatic or experience a far milder illness than if they were not vaccinated.The majority of deaths from COVID-19 — around 98 to 99% —are in unvaccinated people.

Barry Sanders has tested positive for COVID-19.

The former Detroit Lions star and NFL Hall of Famer, 53, revealed on Twitter Friday that he contracted a breakthrough case of COVID-19 and is asymptomatic.

Sanders said he’d stay quarantined until doctors cleared him, and that he expects to be back to normal and rooting for the Lions as a team ambassador at the Sept. 12 game against the San Francisco 49ers.

“Despite being double vaccinated, wearing a mask, and taking all the precautions I could… I tested positive for COVID,” hetweeted. “I don’t have any symptoms, but am staying in until I get the green light from the Docs. I will be ready to go for @49ers on 9/12 @Lions @NFL.”

Want to get the biggest stories fromPEOPLEevery weekday?Subscribe to our new podcast,PEOPLE Every Day,to get the essential celebrity, entertainment and human interest news stories Monday through Friday.

According totheDetroit Free Press, all coaches for the Lions plus over 90 percent of the team’s players are vaccinated, and the team has three players on their COVID reserve list for backups.

Breakthrough cases — COVID-19 infections that occurin people who have been fully vaccinatedagainst the virus — are rare, but possible and expected, as the vaccines are not 100% effective in preventing infections. Still, vaccinated people who test positive will likely be asymptomatic or experience a far milder illness than if they were not vaccinated.

The majority of deaths from COVID-19 — around 98 to 99% —are in unvaccinated people.

source: people.com