The COVID-19 list was created this summer for a player who either tests positive for or who has been quarantined after having been in close contact with an infected person or persons.
Players will remain on the list until they are medically cleared to return.
Griffen, 32, is a former fourth-round pick of the Vikings back in 2010. He signed a six-year, $75 million contract that includes $34 million guaranteed in 2017, but the Vikings declined to pick up his option back in February, which allowed him to become a free agent.
The Cowboys signed Griffen to a one-year, $6 million contract this offseason. However, they later traded him to the Lions before the deadline.