What happened: Adam Schefter reported the deal Saturday. Stille enters Detroit's defensive-line competition during training camp.
Why it matters: The addition gives the Lions another veteran option for their interior rotation. His preseason work will help determine whether he earns a place on the 53-man roster.
By the numbers: Stille has appeared in 18 career NFL games, making one start.
What to watch: Watch for Stille's first practice and his role in Detroit's remaining preseason games.