Browns' Nick Chubb, Demetric Felton test positive for COVID-19, leaving only 1 RB available - USA TODAY

The Browns are suddenly extremely thin at running back and without one of their best players.

Running backs Nick Chubb and Demetric Felton tested positive for COVID-19 on Tuesday, a person familiar with the situation confirmed to the USA TODAY Network. The person spoke on condition of anonymity because they were not authorized to disclose medical information.

Two-time Pro Bowl selection Chubb and rookie sixth-round draft pick Felton will land on the reserve/COVID-19 list.

Chubb and Felton are vaccinated against the virus as are fourth-string running back John Kelly and practice-squad wide receiver Lawrence Cager, the person said.

The Browns announced Kelly and Cager were placed on COVID-19 lists Monday. They also tested positive.

Because the four aforementioned players are vaccinated, they would each need to be free of symptoms and produce two negative COVID-19 tests separated by 24 hours to be activated.

The development puts their ability to play Sunday when the Browns (5-4) visit the New England Patriots (5-4) into jeopardy.