Marcell Dareus failed a conditioning test after reporting to training camp last week.

"He's not the only one, but obviously you want your players to come in and be ready to go," Doug Marrone said Sunday. "We're here for a long period of time and we'll make up for it."

Dareus remained on the active/non-football injury list as the Buffalo Bills held their first training camp practice Sunday evening.

Dareus reported to camp on Monday, but won't re-take the conditioning test until Thursday, at the earliest.

It's the latest setback for Dareus, who was arrested twice this offseason and could face an NFL-imposed suspension.