General manager Ozzie Newsome moved to re-sign Eugene Monroe, Dennis Pitta and Jacoby Jones, but has also added veteran receiver Steve Smith and traded for Jeremy Zuttah to bolster their offensive line.
Bisciotti told the club's official website: "I think retention is more the word. Getting Monroe and Pitta back, Jacoby back, I think that's a coup for us.
"I think Ozzie assessed the free agent market really well as he always does. Steve Smith is the wild card. That's an interesting addition to our team. Not only will he benefit Joe [Flacco], but I think he'll benefit [offensive coordinator] Gary Kubiak."
The Ravens missed the playoffs last season with an 8-8 record.