The cornerback featured in all 16 regular season games for the Super Bowl champions last season, making 25 tackles in the process.
Pees told the AFC North side's official website: "Chykie has improved maybe as much as anybody on this football team in the last couple of years. I really think he's come light years from where he was.
"Now he's starting to look at the right things, playing more instinctively. Now his physical attributes that he has are starting to show off because his mental game has improved. He just has to become more consistent."
The 26-year-old was drafted by the Ravens in 2011.