Ron Rivera said he's "beyond frustrated" with the Washington Football Team's lower vaccination rate and worries about the potential impact it will have on their team.

Rivera said more than 50% of Washington's players have been vaccinated against COVID-19 as they reported to training camp Tuesday.

"We're not where we want to be," he said.

Rivera, who was diagnosed with a form of skin cancer last August and underwent treatments during the season, said he's immunodeficient.

"With the new variant, who knows?" Rivera said of the Delta variant. "When I'm in a group and the group's not vaccinated or there's a mixture, I put the mask on, and I do that for health reasons because nobody really knows. I have to do that. And I just wish and I hope that our guys can understand that."