It's not immediately clear why Dareus was placed on the list. The Bills held their conditioning test Saturday and will open training camp with a public practice Sunday night.
Dareus, who still counts against the 90-man roster limit, may be removed from the list at any time. He may not practice while under the active/non-football injury designation and cannot return to the list once he is removed from it.
The Pro Bowl defender has been under the spotlight this offseason following two arrests that led to him sitting out the final two weeks of organized team activities. He returned to the practice field for mandatory minicamp last month.
In addition, the Bills removed cornerback Leodis McKelvin from the active/physically unable to perform list Saturday. General manager Doug Whaley said the team was easing him back from offseason hip surgery but he is apparently ready to practice Sunday.
The Bills also added guard J.J. Unga to the active/non-football injury list Saturday.